Pentax SP 8x40 WP specs and field of view
Eye relief of 20 mm is the long figure of the SP 8x40 WP, against a size median of 15.1 mm. Close focus is 11.5 ft, and the body weighs 31.7 oz.
- Field of view
- 330 ftat 1,000 yd
- Eye relief
- 20 mm
- Close focus
- 11.5 ft
- Weight
- 31.7 oz
- Exit pupil
- 5 mmcalculated
Why pick it
- Longest eye relief of the 6: 20 mm
- Waterproof
Who the SP 8x40 WP suits
Eyeglass wearers get room for the full view, and the exit pupil works out to 5 mm for dusk. The nitrogen-filled body is rated to 1 m depth (JIS Class 6).
Its field of 330 ft (at 1,000 yd) is last of 6 models in its size, and 31.7 oz is heavier than the 25.6 oz size median.
SP 8x40 WP is one choice among many, and the top binoculars compared covers the most popular ones. SP 8x40 WP is one of 6 models in the 8x40 binoculars comparison.
SP 8x40 WP specifications
SP 8x40 WP figures as Pentax prints them; rows marked * are calculated from the 8x40 size.
| Magnification | 8x |
|---|---|
| Objective lens | 40 mm |
| Prism type | Porro |
| Field of view | 330 ft at 1,000 yd (110 m at 1,000 m) |
| Angular field of view | 6.3° |
| Apparent field of view | 48° |
| Eye relief | 20 mm |
| Close focus | 11.5 ft (3.5 m) |
| Eye spacing range | 57 to 72 mm |
| Weight | 31.7 oz (900 g) |
| Length | 7 in (178 mm) |
| Width | 5.2 in (132 mm) |
| Waterproofing | 1 m depth (JIS Class 6) |
| Fog-proofing gas | Nitrogen |
| Focus system | Center focus |
| Exit pupil | 5 mm * |
| Twilight factor | 17.9 * |
| Relative brightness | 25 * |
* Calculated from the size, not printed by the maker.
SP 8x40 WP against other 8x40 binoculars
SP 8x40 WP shows 330 ft at 1,000 yd, below the 429 ft median of the 6 8x40 models in the chart. At 31.7 oz it is heavier than the 25.6 oz median for the size.
SP 8x40 WP and its nearest rivals
SP 8x40 WP next to the 8x40 models closest to it in maker list price, with the best figure in each column in bold.
| Model | Field of view | Eye relief | Close focus | Weight | Exit pupil | Maker list price | Amazon |
|---|---|---|---|---|---|---|---|
| Pentax SP 8x40 WP | 330 ft | 20 mm | 11.5 ft | 31.7 oz | 5 mm | ||
| Pentax SP 8x40 | 429 ft | 13 mm | 20 ft | 27.2 oz | 5 mm | Check price on Amazon | |
| Nikon Action EX 8x40 CF | 429 ft | 17.2 mm | 16.4 ft | 30.2 oz | 5 mm | ||
| ZEISS Victory SFL 8x40 | 420 ft | 18 mm | 4.9 ft | 22.6 oz | 5 mm |
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Pentax binoculars
SP 8x40 WP questions
SP 8x40 WP: does it work with glasses?
SP 8x40 WP has 20 mm of eye relief, which meets the 16 mm the RSPB advises for people who wear glasses.
SP 8x40 WP: what does 8x40 mean?
SP 8x40 WP magnifies 8 times through 40 mm front lenses, which works out to an exit pupil of 5 mm, the width of the beam of light that reaches each eye.
SP 8x40 WP: how wide is the view?
SP 8x40 WP shows a view 330 ft wide at 1,000 yd, below the 429 ft median of the 6 8x40 models in the chart.