Pentax Papilio III WR 8.5x21 specs and field of view
At 8.5x, the Papilio III WR 8.5x21 pulls in more detail than its 6.5x21 sibling, with a 315 ft (at 1,000 yd) field and the same 1.6 ft close focus. It weighs 10.4 oz.
- Field of view
- 315 ftat 1,000 yd
- Eye relief
- 15 mm
- Close focus
- 1.6 ft
- Weight
- 10.4 oz
- Exit pupil
- 2.5 mmcalculated
Why pick it
- Focuses as close as 1.6 ft
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Who the Papilio III WR 8.5x21 suits
Close study of butterflies or plants suits the 1.6 ft near point, and the weather-resistant body copes with light rain. Eye relief of 15 mm gives modest room for glasses.
The exit pupil works out to 2.5 mm, the smallest among the Pentax models listed, so low light is the weak spot, and the field is narrower than the 6.5x21's 393 ft.
Papilio III WR 8.5x21 or another model: the best binoculars by maker figures shows how the popular ones differ.
Papilio III WR 8.5x21 specifications
Papilio III WR 8.5x21 figures as Pentax prints them; rows marked * are calculated from the 8.5x21 size.
| Magnification | 8.5x |
|---|---|
| Objective lens | 21 mm |
| Prism type | Porro |
| Field of view | 315 ft at 1,000 yd (105 m at 1,000 m) |
| Angular field of view | 6° |
| Apparent field of view | 51° * |
| Eye relief | 15 mm |
| Close focus | 1.6 ft (0.5 m) |
| Weight | 10.4 oz (295 g) |
| Length | 4.6 in (116 mm) |
| Width | 4.3 in (110 mm) |
| Waterproofing | Weather-resistant |
| Focus system | Center focus |
| Exit pupil | 2.5 mm * |
| Twilight factor | 13.4 * |
| Relative brightness | 6.1 * |
* Calculated from the size, not printed by the maker.
Other sizes of the Papilio III
Pentax makes the Papilio III in 2 sizes; a larger front lens adds brightness and weight, and more magnification narrows the view.
| Model | Size | Field of view | Eye relief | Close focus | Weight | Exit pupil | Amazon |
|---|---|---|---|---|---|---|---|
| Pentax Papilio III WR 8.5x21 | 8.5x21 | 315 ft | 15 mm | 1.6 ft | 10.4 oz | 2.5 mm | Check price on Amazon |
| Pentax Papilio III WR 6.5x21 | 6.5x21 | 393 ft | 15 mm | 1.6 ft | 10.4 oz | 3.2 mm | Check price on Amazon |
Pentax binoculars
Papilio III WR 8.5x21 questions
Papilio III WR 8.5x21: does it work with glasses?
Papilio III WR 8.5x21 has 15 mm of eye relief, under the 16 mm the RSPB advises for people who wear glasses, so the edge of the view may be cut off with glasses on.
Papilio III WR 8.5x21: what does 8.5x21 mean?
Papilio III WR 8.5x21 magnifies 8.5 times through 21 mm front lenses, which works out to an exit pupil of 2.5 mm, the width of the beam of light that reaches each eye.