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d여기에서 Pentax Papilio II 8.5×21 쌍안경 검토 – pentax papilio ii 6.5 x21 주제에 대한 세부정보를 참조하세요
Updated with a fully multi-coated optical system Pentax Papilio II binoculars are now better \u0026 more versatile than ever:
➡️ Full Pentax Papilio II 8.5×21 Binoculars Review on BBR: https://www.bestbinocularsreviews.com/Pentax-Papilio-II-85×21-Binoculars-Review-286.htm
With their incredibly close minimum focusing distance these are ideal for the close observation of things like butterflies or flowers when out in the field or for use in a gallery or museum.
Other optical highlights include quality BaK4 reverse Porro prisms and aspherical lens elements for quality and brightness of view that are impressive for a compact binocular at this price level.
So whilst the second generation Papilio is not radically different from the older version, I do feel Pentax have been smart in that they have kept everything that was great about the original and then made small but important improvements without increasing the overall cost and putting it into a different price category which I think is important and makes them even better value for money than before.
➡️Full Pentax Papilio II 8.5×21 Binoculars Review on BBR: https://www.bestbinocularsreviews.com/Pentax-Papilio-II-85×21-Binoculars-Review-286.htm
➡️ Where to Buy Pentax Papilio Binoculars:
https://www.bestbinocularsreviews.com/buy-binoculars.php?binocular=Pentax8.5x21Papilio%20II\u0026id=286
➡️ How to Properly Set Up (Calibrate) \u0026 Focus Binoculars with the Diopter
https://www.bestbinocularsreviews.com/how_to_focus_binoculars.php
➡️ How to Clean Binoculars \u0026 Their Lenses
https://www.bestbinocularsreviews.com/blog/how-to-clean-binoculars-lenses-10/
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pentax papilio ii 6.5 x21 주제에 대한 자세한 내용은 여기를 참조하세요.
Pentax Papilio II 6.5×21 Binoculars (Gray) suitable for …
Pentax Papilio II 6.5×21 Binoculars (Gray) suitable for watching objects both close-up and far away ; VERSATILE BINOCULARS. Specifically developed to view the …
Source: www.amazon.com
Date Published: 8/22/2022
View: 2963
Pentax 6.5×21 U-Series Papilio II Binoculars – B&H
The compact and lightweight 6.5×21 U-Series Papilio II Binoculars combine aspherical optical elements and BAK4 Porro prisms to deliver edge-to-edge image …
Source: www.bhphotovideo.com
Date Published: 5/22/2021
View: 2066
Product Review: Pentax Papilio II 6.5 x 21. | Neil English.net
The Pentax Papilio II 6.5 x 21 can be used as a decent birding binocular, with its quality optics and fairly large and very well corrected field …
Source: neilenglish.net
Date Published: 11/8/2022
View: 3108
Pentax 6.5×21 Papilio II Porro Prism Binocular, 7.5 … – Adorama
PENTAX Papilio 6.5×21 binoculars are the perfect choice for insect observation in the field and in museums and galleries. The enhanced observation capability of …
Source: www.adorama.com
Date Published: 11/4/2022
View: 3361
PENTAX 6.5×21 U-Series Papilio II Binoculars – Tick Tech Go!
The compact and lightweight 6.5×21 U-Series Papilio II Binoculars combine aspherical optical elements and BAK4 Porro prisms to deliver edge-to-edge image …
Source: ttechgo.com
Date Published: 9/29/2022
View: 3611
PENTAX Papilio II 6.5×21 binoculars review – Star-Hunter.ru
The PENTAX Papilio II 6.5×21 is a lightweight and compact binocular with a unique macro focusing function. In my opinion, this is a great option …
Source: star-hunter.ru
Date Published: 6/23/2021
View: 9416
Pentax Papilio II 6.5×21 Binoculars Black | Trekkinn – Tradeinn
Buy Pentax Papilio II 6.5×21 Binoculars – Black, Binoculars from for only 163.99 €. Find outdoor deals in Trekkinn | Fast delivery.
Source: www.tradeinn.com
Date Published: 1/3/2022
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Pentax Papilio II 6.5×21 Binoculars – Optics4Birding
The Pentax 6.5×21 Papilio II binocular features BaK-4 reverse porro prisms which deliver a <20" close focus allowing you to study small objects such as ...
Source: www.optics4birding.com
Date Published: 6/12/2021
View: 9220
PENTAX Papilio II 6.5x21mm Binoculars – Gray for sale online
The Papilio is a unique binocular. No other binocular combines fine handling and easy viewing with an unsurpassed close focus of only 50cm!
Source: www.ebay.co.uk
Date Published: 12/2/2022
View: 7172
주제와 관련된 이미지 pentax papilio ii 6.5 x21
주제와 관련된 더 많은 사진을 참조하십시오 Pentax Papilio II 8.5×21 쌍안경 검토. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.
주제에 대한 기사 평가 pentax papilio ii 6.5 x21
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Product Review: Pentax Papilio II 6.5 x 21.
June 19 2020
Binocular: Pentax Papilio II 6.5 x 21mm
Cost: £109.00 delivered
Optics: Reverse Porro /patented converging objectives for ultra-close focus
Coatings: Fully Multi-coated
Exit Pupil: 3.23mm
Field of View: 7.5 degrees (132m @1000m/ 323ft@1000yards)
Focus Range: 18 inches to infinity
Eye Relief: 15mm
Weight: 290g
Tripod Mountable: Yes
Dimensions: 11.0 x 11.4cm(W/H)
Nitrogen Purging: No
Waterproof: No
Accessories: High quality neck strap, rain guard, carry case, instruction manual and warranty card.
Life is full of surprises; some good and some bad. I’m happy to report a surprise of the pleasant variety in this review, featuring the Pentax Papilio II 6.5 x 21 binocular. Though it’s been on the market for several years now, it fell below my radar partly because I became rather fixated with high quality roof prism binoculars and never considered the old classic designs using porro prisms.
Porro prism binoculars are easier to make well in comparison to their roof prism counterparts. They are also considerably less expensive compared with roof prism models of similar quality. To some, their fall from grace in recent years was not due to their inferior optical quality, but more to their larger size and ‘outdated ergonomics.’ That said, they still have a loyal following among those who appreciate fine optics.
In my recent survey of the pocket binocular market, being somewhat dismayed by the lack of credible user reviews, I went on a shopping spree to test out literally dozens of models – all from the roof prism variety – learning that in general, you get what you pay for. But there is always something new to learn and over the last few weeks I’ve been putting this tiny little binocular through its paces.
And it’s been a revelation!
The name ‘Papilio’ derives from the Latin for butterfly. Pentax were the first company to design these reverse porro binoculars featuring a patented converging objective system that allows these instruments to focus on objects as close as 18 inches – way closer than any roof prism binocular can do. The design was an instant success and thousands of nature enthusiasts snapped them up to provide wonderful stereo-microscope-like views of flowers, leaves, insects etc. The first generation models had a few shortcomings though, as the literature is awash with reports that the anti-reflection coatings were not up to scratch. Experienced glassers reported bright reflections off the eyepiece field lenses and annoying internal reflections, cutting down on contrast and increasing glare in strongly back-lit scenes. Some resourceful users reported ways of reducing some of these annoying shortcomings however, such as using a broad-rimmed hat to cut out peripheral glare for example, or using them in deeply shaded areas where the contrast-robbing deficiencies in the coatings were less obvious etc. Others just accepted their shortcomings and simply enjoyed them as specialised, close-focus devices to study the complexities of the creation.
But then Pentax brought out a second generation Papilio featuring much improved anti-reflection coatings on all glass surfaces. Called the Papilio II, they are offered in two models; a 6.5 x 21 and an 8.5 x 21. Being the proud owner of a superlative 8 x 20 pocket glass by Leica, I was more interested in the lower power 6.5x model, as it seemed to be the least compromised of the two and would also offer me a larger exit pupil, which is both easier to operate in general use and would prove superior to the 8.5x model in low light situations at dusk or dawn, or on heavily overcast winter days.
First Impressions
The binocular arrived double-boxed and contained the binocular, a nice faux leather case, a high quality neck strap, a rain guard covering the ocular lenses, operating instructions and a warranty card. A quick examination of the instrument revealed that all was well; the eyepieces could be extended with a click, the focuser worked smoothly, as did the right eye dioptre ring, and the objective lenses housed inside an optically flat glass window were spotless.
The padded neck strap was a breeze to attach. because it has built-in clips. All one need do is push them through the two holes on the side of the instrument where they are held firmly in place. What a delightful change from threading the strap through tiny little lugs!
The body seems to be made of ABS plastic and covered in a thin layer of texturised rubber which affords excellent grip while manhandling. The double hinges are quite stiff and once the optimal IPD is set, they stay in place. The underside of the binocular has neat little thumb indentations which makes holding it a wee bit easier.
The dioptre ring also served up a pleasant surprise. Instead of rotating smoothly and silently either clockwise or counter-clockwise, this dioptre has click stops that you can hear as you rotate it. At first I was a little concerned that it may not offer the precision of a smoothly rotating right eye dioptre ring, but my wife and I were able to adjust it to accommodate our different settings easily and accurately. Just like some premium roof prism binoculars which have a built-in click stop dioptre, the low cost Papilio II offers the same security against accidental movement. A very clever engineering solution!
The eyecups are plastic and covered in soft rubber. They offer three positions; fully down(for eye glass wearers) or two clicked up positions, affording a maximum eye relief of 15mm. To my relief, I found that they hold their positions very rigidly and work well in field use.
I was also very impressed with the large textured central focus wheel, which moves quickly and very smoothly with no backlash. It has a very large focus travel though, requiring 3 full rotations going from its closest focus at 18 inches right out to infinity. Good focusers are an essential feature of a binocular and I felt Pentax went that extra mile to make sure it worked well.
The objectives are housed behind an optically flat window which also has good anti-reflection coatings applied to it in order to ensure high light transmission and minimise glare. At first I thought the window would be a negative addition, as it might have introduced more unwanted reflections than I bargained for, but as you shall see shortly, I need not have worried!
Another really neat feature of this Pentax Papilio II binocular is the in-built thread on its underside that allows it to be mated to a tripod for more exacting work. This is a rare feature on instruments this size but I can think of many situations – both in the great outdoors and in an indoor studio – where it could prove very beneficial. What a super nice touch!
A quick look through the instrument instantly impressed. The image of a tree trunk some 50 yards distant was bright, tack sharp and very high in contrast. I was also impressed by its wide field of view – 7.5 angular degrees ain’t too shabby! But I was literally blown away when I focused in on a flower bed of Johnson’s Blue Geraniums sat just outside my front door. Wow! The view was quite simply astounding! Placing myself just 2 feet away, the sharpness and colour fidelity of the image was excellent and the level of detail seen within the individual flowers was mesmerising!
Stray Light & Glare Test
But I took heir of myself and proceeded to test the binocular in my usual ways. So first I set up a flashlight test in my living room, by setting my iphone torch setting to its highest(read brightest) level, and standing a few metres back, I aimed the binocular into the intensely bright light beam. Wow! The result was excellent! Compared to a few high quality control instruments (all roofs), the Papilio II showed a few very minor, green coloured internal reflections with no diffraction spikes and no diffused light. Comparing it to my Zeiss Terra 8 x 25 pocket glass, the reflections in the Papilio were only slightly stronger but without any diffraction spikes. Indeed, diffraction spikes are almost a universal feature of roof prism binoculars, however well built, but porro prism instruments seem to be devoid of these. Even the venerable Leica Trinovid BCA 8 x 20 showed an obvious diffraction spike in the same test though its internal reflections were better suppressed than in the Papilio II.
Later in the evening, when the sodium street light came on, I once again compared the Papilio II and the Zeiss pocket glass. As expected, the Papilio II delivered excellent results; very subdued reflections and no diffraction spikes. As a glasser who cannot stand excess glare and internal reflections, I was thoroughly delighted with the results I obtained from this low-cost binocular.
So far so very good!
Collimation Test
By affixing the Papilio II to a tripod, it’s easy to check the collimation of any binocular. Aiming at the hilltops a couple of miles distant, I checked the field of view both horizontally and vertically in both barrels. The results showed very slight horziontal misalignment( as evidenced by a slight asymmetry in the edge of field views) but perfect vertical alignment. I deemed the result quite satisfactory.
A tripod-mounted binocular is also a good way to tweak the right eye dioptre by focusing on the writing on a council notice affixed to a lamp pole some 40 yards in the distance. The dioptre ring clicks as it moves clockwise or anticlockwise making it real easy to get the optimal sharpness in the right barrel when it is locked rigidly in place.
Optical Tests
I conducted my optical tests under a variety of conditions, ranging from bright afternoon daylight in the open air, shaded areas underneath the canopy of trees while walking around in a copse, performance at dusk and finally looking at some bright stars in a twilit June sky around local midnight.
Comparing the performance to my Zeiss Terra 8 x 25 ED, I was very impressed with the optical performance of the Papilio II 6.5 x 21. To my eye, the images of textured tree trunks looked equally sharp in both binoculars, with the Papilio displaying the wider field of view at a smaller image scale. Contrast was excellent in both instruments, which both sport very large sweet spots, and only showing slight softening at the extreme edge of the field. The Papilio features aspherical ocular lenses which keeps off-axis aberrations at bay. In this respect, the Papilio II produced less field curvature(as evidenced by aiming at a telephone pole a few tens of yards distant and moving the pole to the edge of the field) than the Zeiss. Indeed, I pulled out my wife’s Opticron Aspheric LE 8 x 25 which also sports aspherical ocular lenses and displays superior edge sharpness to the Zeiss Terra, as reported in a previous blog. Well, the Papilio II proved fully the equal of the Opticron pocket glass on the same target!
Under the brightest daylight conditions it is easy to detect reflections off one or more of the ocular lenses as this manifests as a subtle circular glare disc covering much of the field. Alas, these annoying reflections are all too common on a lot of instruments that skimp on their application of anti-reflection coatings. I was very pleased to see that the Papilio II also passed this test with flying colours – that is, it was not present. Chromatic aberration was pretty much non-existent even when pointed at a tough target like a television aerial against a bright overcast sky.
Comparing the Papilio II to my Zeiss 8 x 25 roof prism binocular under the shade of conifer trees near my home, I found both binoculars to yield up equally bright and sharp images of ground vegetation just a few metres away. When I did the same tests with the Opticron, I felt the Papilio served up slightly brighter images although the sharpness was judged to be more or less the same.
Going out at dusk around 10.15 pm, I compared the brightness of the images of tree branches about 50 yards distant served up by the Pentax Papilio II, the Zeiss Terra ED 8 x 25 and my Leica Trinovid 8 x 20. The Papilio II and the Zeiss pocket glass threw up images that were about equally bright, with the nod going to the Zeiss ( but only just!). Comparing the Trinovid 8 x 20 to the Papilio II in similar tests showed that the images were noticeably brighter in the latter instrument.
All in all, these were excellent results showing that the light transmission efficiency of the Papilio was very good indeed based on Zeiss’ published data on the Terra glass, which has 88 per cent transmission. The dimmer images served up by the Trinovid was easily explained in terms of its smaller exit pupil (2.50mm compared with 3.23mm).
My final optical tests were conducted under a twilit night sky ’round about local midnight. I aimed the binocular at the bright summer star, Vega, and compared the views in both the Zeiss and the Papilio II. Both instruments focused Vega down to a crisp, white pinpoint that held its sharpness across nearly all of the field. Moving the instruments horizontally showed better off axis performance than those exhibited by moving the star up and down, to the top and bottom of the field, respectively. The only difference I could detect was the darker sky hinterland in the 8 x 25 Zeiss pocket glass, perhaps owing to its higher magnification. But even so, the differences weren’t huge.
These tests convinced me that the Pentax Papilio II 6.5 x 21 has excellent optics, especially for its very modest price tag. Its simpler design to roof prism binoculars means it has less optical components overall, and the combination of aspherical ocular lenses, high quality Bak 4 prisms and fully multi-coated optics all contribute to this high optical field performance.
Further Notes from the Field
Using the reverse porro prism designed Papilio II takes a bit of getting used to. At first, its strange body shape reminded me of a scene from a Star Wars Movie when Luke Skywalker used weird looking binoculars to monitor the movements of marauding Sandmen lol. That said, it’s quite easy to hold steady and most anyone can use it, including kids.
Though it is just as lightweight and portable as a pocket binocular, it doesn’t fold nearly so compactly as a dual hinged pocket glass like the Zeiss Terra 8 x 25, as shown below:
The Pentax Papilio II 6.5 x 21 can be used as a decent birding binocular, with its quality optics and fairly large and very well corrected field of view. Its super-fast focus wheel also helps in this regard. One drawback of its lower magnifying power compared with more conventional glasses (which almost invariably use powers of 7x to 10x) is reduced range. Sometimes you just need 8x or 10x to bring the subject sufficiently close in order to get a good view of it. And 6.5x may not be the best choice for a twitcher, where the subject is heavily camouflaged, small or located at a lengthy distance from the user. For close-range work (read within a couple of hundred yards) it should work well though. Its small aperture will also limit its use to bright daylight conditions most of the time, and thus will be less suitable for work when lighting is compromised, such as at dawn or dusk, in which a larger aperture glass would serve you better.
The instrument is absolutely head and shoulders above any other instrument on the market if your speciality is close-up work, like studying insects, flowers, rocks and minerals. It will also prove indispensable to artists who paint still life scenes indoors, where the instrument can be permanently mounted on a clamp or tripod, where the subject can be examined in exquisite detail under optimal lighting conditions. It also serves as a very effective stereo microscope, affording very comfortable and immersive views of a wide variety of subjects.
I have noted that for such close-up work, the Papilio II 6.5 x 21 seems to provide greater than advertised magnification. When viewing flowers at 18 inches, for example, the power seems closer to 7.5x or 8x and not the advertised 6.5x. This is probably true of the 8.5 x 21 instrument as well, where a power of 10x or more might be expected during these close-range observations.
The binocular is not weather or water proof, which might be a negating factor in choosing it for general purpose viewing or bird watching. In cold weather, it will fog up when brought from the outside to a warm indoor room. I would not recommend using the instrument in rainy or showery conditions. But there are ways to protect it from fogging up internally. For example, by placing the instrument back in its case with the rain guard on prior to bringing it indoors is a good move, as would storing the instrument with an effective desiccant, like silica gel, will help keep moisture at bay and prolong its shelf life, especially if you live in humid climes.
The instrument is not really recommended for astronomical use, though it will serve up very nice news of illuminated cityscapes owing to its good control of stray light within the optical train. That said, it ought to serve up nice images of the Moon and bring some of the brighter deep sky objects into view from a dark, country sky.
I have noted that the optically flat glass window protecting the objective lenses is a magnet for attracting pollen. Not a big deal in the scheme of things, but something to bear in mind. You’ll need a soft lens brush to keep the window clean. I tend to give it a brush down after any prolonged spell(more than 30 minutes or so) outdoors.
Another niggle reported by some users of the Pentax Papilio II binoculars is that the supplied carry case is too small to comfortably house the instrument when the neck strap is attached. And while removing the strap is one solution, it might not be to the liking of some individuals who wish to use it in the spur of the moment. I have found a solution of sorts, by placing the binocular in the case while feeding the two ends of the strap out from both ends of the case cover. The strong velcro seal is plenty strong enough to hold the binocular in place inside the case and the straps can be used to carry it about!
As always, I store the binocular inside its case with a sachet of silica gel and store it in a cool( 60 F), dry and well ventilated pantry to protect against fungal infestation.
Conclusions: The Pentax Papilio II 6.5 x 21 was a very pleasant surprise. For its modest cost of just over £100, you get very decent classic porro prism optics with unbeatable close-focus capability. I think every binocular enthusiast should own one! Far from being a one-trick-pony, it will serve as a very versatile instrument for casual viewing, nature study and bird watching. Just understand that it can’t be used in rainy conditions and needs protection from internal moisture build up in humid climates requiring extra care when storing for long-lived use.
Highly Recommended!
Neil English is the author of seven books in amateur and professional astronomy. If you like his work, please consider purchasing one of his books. Thanks for reading!
De Fideli.
PENTAX 6.5×21 U-Series Papilio II Binoculars
PENTAX 6.5×21 U-Series Papilio II Binoculars
5 –
A masterpiece of literature
John Doe
I really enjoyed this book. It captures the essential challenge people face as they try make sense of their lives and grow to adulthood.
Review:by, written onMay 4, 2006
PENTAX Papilio II 6.5×21 binoculars review
PENTAX Papilio II 6.5×21 binoculars review
Introduction
I received an unusual PENTAX Papilio II 6.5×21 binoculars for testing. I have been interested in these binoculars for a long time, so I started testing them with interest. It is unique in that it allows you to focus at a distance of only 50 cm from the subject. This feature can be interesting for the study of various small objects, insects, plants, museum exhibits, etc. A special lens shift mechanism is also declared, which allows you to see a single field of view without double vision when examining close objects. An aspherical element is declared in the eyepieces to reduce distortion. The belt has a quick release design. In addition, the binoculars themselves are light and compact, and due to the small magnification and good ergonomics, the image is very stable and shaking of the hands is practically not felt.
Declared technical characteristics:
SKU: 62001
Type: binoculars with a central focusing mechanism and “porro”-prisms made of BaK4 glass
Objective lens: 2 elements in 1 group
Eyepiece lens constructions: 5 elements in 5 groups (note: aspherical element declared)
Magnification: 6.5x
Objective lens diameter: 21 mm
Angle of view actual: 7.5° (note: lettering on the case)
Linear field of view at 1000m: 131m
Exit pupil: 3.2mm
Eye relief: 15mm
Relative brightness: 10.2
Diopter adjustment range: +/- 4 D
Minimum focusing distance: 50cm / 0.5m
Eyepiece Ring: Helicoid Type
Height: 55mm
Width: 110mm
Depth: 114 mm
Weight: 290g
Waterproof: no
Accessories: tripod adapter U (69552)
Prism coating: BaK4 (note: this is not a coating, but a prism material)
Lens coating: multilayer coating of all optical elements
Minimum focusing distance: 0.5m
Twilight factor: 11.7
Interpupillary distance: 56 – 74 mm
Package and body
I got the binoculars without a box and a belt, but with eyepiece covers and a case (demo version).
The body of the binoculars is made of durable plastic with rubber “armor”. At the bottom there is a thread for a 1\4″ photo tripod. The size of the binoculars, depending on the interpupillary distance, can vary from 111 x 115 x 56 mm to 91 x 115 x 66 mm. The weight of the binoculars with covers and a cover is 351 grams (binoculars 293.6 g, cover 8.1 g, case 49.7 g). Case made of synthetic leather, with a hole for a belt, size about 130 x 130 x 66 mm. The binoculars have no front covers, so it is better to transport them in a case. The country of manufacture is indicated at the bottom of the binoculars (China ).
The binoculars are not waterproof, do not carry out observations in the rain, fog up the optics, or drop them into the water. Before bringing the binoculars from the cold to a warm room, I recommend closing the eyepieces with lids and hiding them in their own case or a sealed bag / bag. Protect binoculars from impacts, falls and mechanical damage – this applies in general to all binoculars.
Mechanics and focusing
The mechanism for changing the interpupillary distance is atypical – the lenses themselves remain stationary, the eyepieces with the prism unit are displaced, and at the same time. The measured range of interpupillary distance is 56-74.5 mm, which corresponds to the declared one.
Due to their small size, a special grip is required to hold the binoculars – the fingers of one hand should cover the fingers of the other hand. There are thumb rests on the bottom of the binoculars. Thanks to the rubber coating, the binoculars sit firmly in your hands and do not slip out.
Focusing is carried out by a plastic ribbed drum 17.9 mm in diameter. Full drum stroke – 3 turns, rotates very (even too) easily. When focusing, the lenses are displaced both along and across the optical axis. Apparently, this is the special mechanism for preventing ghosting when viewing objects at close range. Additional diopter correction is carried out by rotating the right eyepiece, and with clicks and fixation, that is, it will not work easily and imperceptibly to knock off the focus of the right eyepiece. No channel desynchronization was detected; when focusing “back and forth”, the diopter correction of the right eyepiece is not disturbed, and there is no backlash either. The focuser is very responsive, but it works with the slightest touch. The measured minimum focusing distance was 0.58 m, which almost coincides with the declared one.
The body of the eyecups is metal on the inside, rubber on the outside, diameter 34.5 mm. There are three positions (screwed in, middle position, unscrewed) with lock and click.
There are adjusting screws, they are under the rubber “armor”, however, without sufficient qualifications and an urgent need to climb into the adjustment, I do not recommend. If your Pentax binoculars double – contact the official service center.
I personally have practically no questions about the mechanics – it is gorgeous, everything is thought out to the smallest detail. The only caveat is that focusing is too easy, but for some it can be both a minus and a plus.
Optics
The binoculars have a 6.5 x 21 formula, that is, the manufacturer claims a magnification of 6.5x and an aperture (lens diameter) of 21 mm.
The front of the binoculars is protected by plane-parallel glass with green coating, then there are two-lens objectives (blue coating), a block of prisms (green coating) and eyepieces (green coating). All optical surfaces bordering on air are coated.
Unfortunately, it is impossible to directly measure the aperture of binoculars without disassembling, but an indirect measurement using a digital caliper showed a value of 21.6 mm.
To determine the aperture, I decided to conduct a “test with a flashlight”: the binoculars are focused to infinity, a flashlight shines from the eyepiece, a light circle is projected from the side of the lens, the diameter of which is measured using a caliper or camera matrix (in specific testing – Canon 5D Mark II). This is exactly the working aperture. The flashlight test detects hidden aperture or aperture clipping by internal elements. The aperture measured in this way was 19.3 mm. Also, the aperture is partially cut off from one or two edges by prism blocks. Due to the aperture diaphragm, the brightness of the picture may decrease by about 20%.
The exit pupil is a light circle at the exit from the eyepiece at a certain distance from the eye lens, in fact it is an image of the objective (aperture). By projecting the exit pupil onto a sheet of paper or onto a photodetector matrix (in specific testing, the QHY5III178m camera), you can measure the exit pupil size. Testing with the QHY5III178m camera showed an exit pupil size of 2.87 mm (focus at infinity). There is also parasitic glare near the exit pupil.
To measure the magnification, two images of a ground object were taken – through binoculars and without binoculars. Then the size in pixels of an object in the field of view in each of the images is determined, we divide one by the other and get the multiplicity. For the PENTAX Papilio II 6.5×21, the magnification measured in this way was 6.7x.
Knowing the magnification and size of the exit pupil, you can calculate the working aperture – it is 6.7*2.8=19.2 mm, which agrees well with the test using a flashlight (19.3 mm).
The diameter of the eye lenses of the eyepieces is 14 mm, the lenses are recessed 2.7 mm relative to the eyecup. The measured field of view was 47 ± 0.4 degrees. The measured eye relief is 14 ± 1 mm. With glasses, you can see the entire field of view, but literally at the limit.
Image
Daytime testing of the PENTAX Papilio II 6.5×21 binoculars showed that approximately 30-40% of the field of view (from the center) is clear, then a gradual degradation in sharpness begins due to the curvature of the field and astigmatism (see previous photo). Chromatism on the axis is imperceptible, but along the field there is lateral chromatic aberration. The edge of the diaphragm is colored blue. There is also a slight pincushion distorsia. Due to the fact that the stereo base of the binoculars is less than the interpupillary distance, the 3D effect is weak when observing distant objects – the image is “flat”, but for observing close objects (less than 3 meters) this is even a plus. There is a slight double vision of the field diaphragm in the macro mode – two circles with a field of view do not completely converge into one; when observing an object at infinity, this effect is absent.
The binoculars have excellent collimation, the eyes do not get tired even from prolonged observations.
There is color distortion (pink tint). This is in good agreement with the stated light transmission graph (falloff in the area of green rays):
When tested at night, the stars at the edge of the field of view look like arcs (parallel to the edge of the field of view), and with a slight refocusing they turn into “sticks” (from the center to the edge). From memory, the PENTAX Papilio II 8.5×21 provided better image quality across the field, but the image was noticeably darker. Despite the small aperture, the binoculars are quite suitable for exploring the constellations, bright objects of the Messier catalog (M 45 Pleiades, M 42 Orion Nebula, M 31 Andromeda Nebula, etc.)
Summary
+ Lightweight
+ Compact
+ Focusing from 50 cm
+ Glasses show the entire field of view
+ Excellent mechanics
+ Excellent collimation
+ Fully coated optics
+ Thread for photo tripod
+ Low distortion
– Working aperture is less than declared
– Clipping of the light beam with prisms, reflections near the exit pupil
– Color rendering distortion
– Degradation of sharpness from the middle of the field of view.
The PENTAX Papilio II 6.5×21 is a lightweight and compact binocular with a unique macro focusing function. In my opinion, this is a great option for constant carrying in a bag or backpack, for daytime observation of insects, birds, landscapes. A small, but at the same time sufficient for most types of observations, the magnification allows you to achieve a stable image. Large range of interpupillary distance adjustment allows both adults and children to use binoculars.
Despite some shortcomings, I liked the binoculars very much – the formed image is pleasing to the eye, and its macro capabilities are generally out of competition.
You can buy PENTAX Papilio II 6.5×21 binoculars in the RICOH online store.
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Pentax Papilio II 6.5×21 Binoculars Black
Product description Pentax Papilio II 6.5×21 Binoculars
Automatic translation Original description available here
FEATURES:
– New fully multi-coated optics
– Close focus to 50cm for macro observation, unique in the market
– Aspherical lens elements providing edge-to-edge sharpness
– High Quality BaK4 prism to enhance transmission and resolution
– Dual-axis, single body housing with synchronized eye-piece IPD adjustment
– Rubber covered body provides protection and grip
– Twist-up eyecups
– Fine diopter adjustment and fast and easy central fine-focusing
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Pentax Papilio II 6.5×21 Binoculars
The Pentax 6.5×21 Papilio II binocular features BaK-4 reverse porro prisms which deliver a <20" close focus allowing you to study small objects such as butterflies, dragonflies, animal footprints, landscape features and more. To reduce shaking when observing close or distant objects, you can connect the Papilio II to a tripod using the integrated 1/4"-20 socket. With a 3.2mm exit pupil, 15mm eye relief, adjustable interpupillary distance and diopter you can use the Papilio II binoculars with comfort and stability. The 6.5x magnification and 21mm lenses allow you to get the perfect up-close images while out in nature. Papilio is the Genus of swallow-tailed butterflies. Even if you already own binoculars, you need this one too. Nothing else lets you look at a butterfly or a flower this closely. Closer than just close—if a butterfly lands on your knee, you can actually focus on it through your Papilio. You can see a nearby butterfly as if you were examining it through a magnifying glass - and this is not limited, you can easily observe birds or other animals with the magnification that these offer. This specialized binocular belongs in every nature lover's pocket. Included In The Box Case Strap Rainguard Objective Lens Covers
PENTAX Papilio II 6.5x21mm Binoculars – Gray for sale online
Lightweight binoculars for close-up observation
These binoculars are unique for their minimum focus distance of about 50 cm. They are designed for the specific purpose of allowing the observation of close-up objects, although they can focus up to infinity. Focusing at close range is easy and precise, and requires very little force with just a fingertip. Unavoidably, it takes quite a bit of rotation of the focus knob to change focus from infinity to closest distance. I chose the 6.5x model over the 8.5x because these binoculars have no image stabilization, and hand-holding the 8.5x model steady takes quite a bit more effort. These binoculars have a standard tripod mount, but require an adapter for mounting on tripods with a large camera base. Attaching an Arca or other tripod plate to the binoculars also requires an adapter. Eyepiece covers are provided, but not a cover for the objectives. The latter are covered by a single glass plate, slightly recessed but still vulnerable to accidental fingerprints. The bag provided with the binoculars gives some protection, but is not rigid enough to avoid pressing down on the front glass plate if stuffed into a backpack. Protection against limited dust seems reasonably good, but these binoculars are not water-, dust- or moisture-proof. The reversed Porro-prism design with a particularly small distance between objectives results in a peculiar 3D rendering at short distances. Items located at significantly different distances still give a sufficient 3D perception, but each item (e.g. a ball, a dog’s face) looks flat like a cutout from a spring-up children book. This may feel disturbing to some people. This may be the reason why some people report an “odd” visual feeling when using these binoculars. Other people feel just fine, or grow used to the peculiar 3D rendition. If you want to avoid this problem, choose a regular Porro-prism design with a larger distance between objectives (but then you must also give up the close-focusing capability). In my case, the intended use is mainly observing small objects located just outside hand reach in the field, in order to avoid risking a fall or an unplanned bath in swamp water. Other people in their 50s or older find these binoculars very useful to compensate for the age-related loss of focusing capabilities of the eyes (which sooner or later affect almost everybody), as well as for observing small objects (like animals or flowers) without having to encroach on them. Use as ordinary binoculars is not as important to me, but this use is also possible. Because of the 21 mm objectives, however, these are not low-light binoculars. For the above uses, there is simply no substitute for these binoculars. Surgical loupes and head-mounted magnifiers are designed for shorter distances (within comfortable arm reach), stereomicroscopes for even shorter distances and for table-top use. Monocular viewers (also called close-range telescopes) force you to give up your binocular vision and are generally perceived as uncomfortable.Read full review
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