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Pentax 8.5x21 U-Series Papilio II Binocular Suitable for Watching Objects Both Close-up and far Away

Based on 1,570 reviews
Condition: New
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$139.00
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Arrives Sunday, Nov 15
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At a glance

Condition
New
Style
Papilio II 8.5x21
Weight
10.4 oz
Color
Gray
Special Feature
Lightweight, waterprrof
Specific Uses
Hiking & Outdoors
Mount Type
Tripod Mount
Warranty
Limited lifetime

Features 4

  • Fully multi coated optics assure maximum light transmission resulting in high quality viewing; Every surface of every element is fully coated minimizing internal glare and flare and giving a bright clear view
  • Unique Uni body design enhances durability by locking objective lenses in a single housing and synchronizing the eyepiece movement; This minimizes moving parts and assures these binoculars will function properly and clearly for years to come
  • Aspherical lens elements, which are critical in compact binoculars, provide exceptional edge to edge sharpness; This assures that items on the edge of your field of view are just as sharp as those in the center
  • The UP models are offered in unique, attractive color options that match your personal style

Description

The compact and lightweight Binocular combines aspherical optical elements and BAK4 Porro prisms to deliver edge-to-edge image sharpness with a 51° apparent angle of view. The optical elements are also fully multi-coated to provide a high transmission of light. With a 8.5x magnification and 21mm objectives, you obtain a notable magnification, insignificant image jitter due to unsteady hands, and a compact form factor. You can easily spot your targets with a wide 6° angular field of view and quickly bring them into focus with a center focus wheel. In addition to observing distant scenes, birds and game, the minimum focus of 20" allows you to study in detail close objects like butterflies, animal footprints, marks or landscape features. To reduce image jitter while observing distant objects or for prolonged observations, you can connect the binocular to a tripod via an integrated 1/4"-20 socket. The binocular also features a 2.5mm exit pupil, a 15mm eye relief, an interpupillary and a diopter adjustments. Unique Uni-body design enhances durability by locking objective lenses in a single housing and synchronizing the eyepiece movement The binocular is very compact, lightweight, and features a single piece frame that houses objectives, which allows for a synchronized interpupillary adjustment. To accommodate eye glasses wearers, the binocular offers twist-up rubber eyecups. Also included are a carrying case, a neck strap, and eyepiece covers.

Specs 38

Brand Pentax
Age Range (Description) Adult
Special Feature Lightweight, waterprrof
Objective Lens Diameter 21 millimeters
Magnification Maximum 8.5
Features Lightweight, waterprrof
Specific Uses Hiking & Outdoors
Mount Type Tripod Mount

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Nov 15

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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Top Amazon Reviews


Banger product
Style: Papilio II 8.5x21
These binoculars have made my walks take way longer. I got them because I was interested in looking at bugs and plants and other small things with the extremely close focusing distance. What I didn't expect was for it to not only do that extremely well (like seriously I have never seen tiny things in so much detail it's amazing) but to also kind of replace my regular birding nocs. Now let me be clear, these aren't going to do much for anything further than 50 yards maybe, but how light they are and easy to use with the single smooth focusing wheel, you can easily use these entirely single handed!(It's surprisingly good for casual backyard birding with a beer in hand, you can easily focus on a bird in a tree and effortlessly change focus to a bird that just landed on a feeder 4 feet away from you) For viewing small things I don't think it gets better than these. They make everything so interesting, every bug and flower and tiny thing just looks so amazing. The textures everything has is incredible to see, even looking into someone's eye blew me away. Now for cons if I have to give some, there isn't really any protection nor a cover for the front end sight piece, though it does come with covers for where you look through. Other than that though I guess it could have also come with a microfiber cloth for the lenses and the included strap is not the best. Overall I'd say these are excellent for the price and I would highly recommend them to anyone I know even remotely interested in the whole world around them, including the tinniest of details. ... show more
Reviewed in the United States on October 12, 2024 by Matthew

The ultimate botanical, butterfly and backpacking binoculars!
Style: Papilio II 8.5x21
We learned about these from Betty Gatewood during a class she gave at the 2018 Shenandoah Wildflower Weekend. Betty does exquisite flower illustrations ranging from simple journaling to rigorous botanical illustration. She needs to see what she is drawing VERY clearly. She is used to critical viewing, and can tell when a tool is above average. There are three big advantages to these: 1) crisp, clear, undistorted image and colors; 2) small, light, easily packed size; 3) ability to focus just about at the end of ones fingertips! Without #1 the other two really don't matter. But the image IS right up there. Pentax used a "porro" prism setup instead of the more popular "roof" prism design. This means the glass has more joints that moisture can seep into. Pretty sure Pentax thought of that... it feels VERY well sealed! But this also means that the light has a less tortured path through the glass, which help the clarity and color correctness. This also means that the far end of the glass (the "objective" end) can have lenses closer together, which allows a closer focus without the feeling of going cross-eyed. How important is the close focus? A butterfly won't settle at all if you get very close. But if you are three or four feet away a settled butterfly will stay put until the reason it landed goes away. An eight times magnification of a butterfly at four feet is a sight to behold! You can see details of wing patterns, antenae, legs, etc. that you would normally have to use a magnifying glass for on one that was dead. Folks who love looking at flowers in national parks and gardens know there is a "do not pick" policy. With the close focus you can see such flowers BETTER than if you held them in your hand... without having to bend over! And all this comes in a small light package. No, ultralight backpackers need not apply. This isn't THAT light. But it DOES pack easily in the brain or outer pocket of a pack, and weighs less than a lot of other FAR less capable glasses. This has to be the the ultimate botanical, butterfly, and backpacking binocular! ... show more
Reviewed in the United States on September 28, 2018 by Amazon Customer

Great for close detail.
Style: Papilio II 8.5x21
Finally found the binoculars that allow me to see in clear detail the birds on my feeders that are less than 20’ away. These provide close up detail with an affordable price tag. I am very pleased with this purchase!
Reviewed in the United States on August 29, 2026 by Gayle Mast

Quality control
Style: Papilio II 8.5x21
The binoculars are bright, light weight and great near focus. The problem I had with the first pair seems quite common in that many say hard to focus. In fact the first pair which I sent back had this problem. For example when viewing a star the image was double and suspect the prism in one ocular was out of alignment. The second pair is great and all is working as advertised and would give them a 5 if not for the the quality control issue. I also have a pair of the 6.5 which are also great if not slightly better for focus and brightness. ... show more
Reviewed in the United States on July 27, 2020 by Donna B

Best all around closeups on a budget, and for hikers! (compact and light!)
Style: Papilio II 8.5x21
The lense configuration? Absolutely awesomme for locating items you want to find, even in flight. I have some very expensive binoculars, but this little pair with the closeups of bugs and wildflowers, the comfort, easy focus, and VERY lightweight, these are just awesome for all around. And, cheap!!!
Reviewed in the United States on April 24, 2026 by ehdy

Great for up close bird watching
Style: Papilio II 8.5x21
I was skeptical so I checked the return policy because I didn’t think it would be as good as advertised. I was wrong. They really ARE up close too! I have a hummingbird feeder on my porch and I can use these to see them up close while I’m inside, less than 10’ away. They really are as good up close as they are far away. ... show more
Reviewed in the United States on May 30, 2026 by JD

Easy focus on very close objects
Style: Papilio II 8.5x21
Very clear and focusses on close objects.
Reviewed in the United States on August 3, 2026 by Cristina

Lightweight, handy, close focus binos
Style: Papilio II 8.5x21
Bought these primarily for close focus feature and have been happy with the performance. As sort of an amateur naturalist, I was trying to get closer looks at things like insects or tree leaves that were out of reach but close enough I couldn't focus on them with my other binoculars, and these did the trick. Given that they are small, lightweight, and relatively inexpensive I keep them in the car and carry them when I go walking in the parks just in case there's something interesting to look at. ... show more
Reviewed in the United States on May 31, 2025 by Ohio Customer
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