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Pentax 8.5x21 Papilio II Series Porro Prism Butterfly Binocular with 6.0 Degree Angle of View, Gray

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Pentax 6.5x21 Papilio: Picture 1 regular $146.00

About Pentax 6.5x21 Papilio

Pentax binocular series is called Papilio, the Latin word for butterfly, PENTAX Papilio 8.5x21 binoculars are the perfect choice for insect observation in the field and in museums and galleries. The enhanced observation capability of the Papilio binoculars is made possible by a PENTAX Convergent Lens Optical System Engineering (CLOSE) mechanism. The CLOSE mechanism automatically slides the left and right objective lenses toward the center when the focus is fixed at a short distance.

Pentax 6.5x21 Papilio Features

  • No other binoculars like them on the market!
  • Ideally suited for viewing insects, birds, artwork or any other object at close ranges
  • Tough rubber covered exterior provides a sure grip and protects the internal mechanisms
  • C.L.O.S.E. (Convergent Lens Optical System Engineering) allows them to focus down to 1.6 feet
  • Sleek, contemporary ultra-compact body with unibody construction
  • Revolutionary dual-axis, single body housing with synchronized eye-piece adjustment to assure correct optical alignment for comfortable viewing
  • Fast and easy center focusing for handling ease
  • Helicoid eyepiece rings for extra viewing comfort
  • Fully multi-coated optics to eliminate harmful ultraviolet rays while ensuring 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.
  • High quality BaK4 Porro prisms transmit more light at the edges to enhance illumination for easier viewing in dim light

Pentax 6.5x21 Papilio Specifications

Porro Prism, Center Focus, Close Focus binoculars
Real Field of View
Field of View at 1000m
105 m
Exit Pupil
2.5 mm
Eye Relief
15 mm
Focusing Range
1.6' to infinity
Eyepiece Ring
Height & Width
4.60" x 4.33"
2.2" (55 mm)
10.2 oz.
Pentax 1 year warranty
The Pentax "Worry Free" Warranty:
If your Pentax Binocular purchased from Adorama requires repair, Pentax will repair or replace it to the original purchaser (even if damaged by fault) for a charge of $19.95, to cover handling and return shipping. *This warranty does not cover cosmetic damage, theft or loss. (Replacement may be with comparable model at Pentax's discretion if the original model is no longer available.)
Mfr #

Pentax 6.5x21 Papilio Reviews Powered by TurnTo®

Review Snapshot®


(based on 7 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



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  • 2 Stars



  • 1 Stars



Reviewed by 7 customers


Great buy for the money.


Nice pair of glasses. I use them for butterflying and on general walks with my dog. Clear, close focusing and small enough to carry for general use.


Compact with sharp images


A great pair of binoculars for casual use. A friend recommended these as being a great value for the money. We are starting to become interested in bird watching and this fits the bill.




Bought for my wife who is botanical artist who is passionate about getting details right. Liked ours so much we just got one for 6 year-old grandson as size, quality, and close-up capability were perfect for young birder.

(2 of 2 customers found this review helpful)




He is my faithful companion when I am of excursion since it allows me to observe flowers and animals that are near but which they are inaccessible because they are in sites difficult to arrive.

(1 of 1 customers found this review helpful)


I absolutely LOVE my Papilio binos.


I have raved about the product & shared with others

(1 of 1 customers found this review helpful)


Great Binocular - Does What it Claims!


I bought these because I've had good experiences with other Pentax optics. I wasn't disappointed. The close focus capability is outstanding, with good contrast and 3D effect. Build quality is a little above average, but I don't think I'd want to drop them - they're not that robust. Nice coatings on the lenses with minimal reflections and good light gathering for such a small aperture. Eye relief is not adequate for most glasses wearers. I wouldn't consider these an all-around binocular and didn't buy them for that reason. I bought them for close-up veiwing of insects and for that they are excellent. You really can't go wrong for this price.

(5 of 5 customers found this review helpful)


Works as advertised


The Pentax Papilio is unique and has its own niche. The convergent lenses move together and focus down to about 18". This allow stereo viewing of most anything you see, and you can look at stuff you never thought to look at before. It really works as advertised--I easily read the writing on jeans rivets, light fixture stickers and car tires from 6 feet away. This is a $[...] product, so don't expect it to perform at $1,000 prices. There's a fair amount of glare/internal reflections with bright objects, and a little softness in the focus. It is a solid product, with Pentax quality, and well worth the price. It compares well with similarly priced binoculars. The carrying case is a tad too small, for it's pretty hard to insert the binos with the neck strap attached. However, the neck strap has quick detach anchors and is easily removed. Finally, you must unthread the neck strap if you with to mount the eyepiece covers on the neck strap.

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