Pentax AD 8x25 WP specs and field of view

Eye relief of 21 mm is the longest figure among the Pentax models listed, and the AD 8x25 WP, from the AD WP (x25) series, sets it in a roof prism body of 10.6 oz. Close focus is 9.8 ft, against a size median of 8.2 ft.

Field of view: 288 ftat 1,000 yd
Eye relief: 21 mm
Close focus: 9.8 ft
Weight: 10.6 oz
Exit pupil: 3.1 mmcalculated

Why pick it

10.6 oz, lighter than the typical 10.9 oz
Longest eye relief of the 21: 21 mm
Waterproof

AD 8x25 WP: width of view at 1,000 yd, against the median of the 21 8x25 models.

Who the AD 8x25 WP suits

Eyeglass wearers get a full view, and the light body suits long carries. It is rated to 1 m depth (JIS Class 6), and the price band is $100 to $200.

The field of 288 ft (at 1,000 yd) is last of 21 models in its size, against a median of 357 ft, and the exit pupil works out to 3.1 mm.

AD 8x25 WP is one choice among many, and the top binoculars compared covers the most popular ones. AD 8x25 WP is one of 21 models in the 8x25 binoculars comparison. Pentax lists it in the $100 to $200 price band, alongside the models in best binoculars under $200.

AD 8x25 WP specifications

AD 8x25 WP figures as Pentax prints them; rows marked * are calculated from the 8x25 size.

AD 8x25 WP specifications
Magnification	8x
Objective lens	25 mm
Prism type	Roof
Field of view	288 ft at 1,000 yd (96 m at 1,000 m)
Angular field of view	5.5°
Apparent field of view	42°
Eye relief	21 mm
Close focus	9.8 ft (3 m)
Eye spacing range	33 to 72 mm
Weight	10.6 oz (300 g)
Waterproofing	1 m depth (JIS Class 6)
Fog-proofing gas	Nitrogen
Focus system	Center focus
Maker list price	$100 to $200
Exit pupil	3.1 mm *
Twilight factor	14.1 *
Relative brightness	9.8 *

* Calculated from the size, not printed by the maker.

AD 8x25 WP against other 8x25 binoculars

AD 8x25 WP shows 288 ft at 1,000 yd, below the 357 ft median of the 21 8x25 models in the chart. At 10.6 oz it is at or under the 10.9 oz median weight for the size.

Opticron Imagic HD X-Wide 8x25465 ft
Nikon Trailblazer II 8x25435 ft
Celestron Outland X 8x25432 ft
Nikon Trailblazer 8x25 ATB429 ft
Hawke Frontier ED X 8x25421 ft
ZEISS Victory Pocket 8x25390 ft
Leupold BX-1 Rogue 8x25 Compact377 ft
Minox X-active 8x25363 ft
Bushnell H2O 8x25 Compact361 ft
Leica Noctivid Compact 8x25360 ft
ZEISS Terra ED Pocket 8x25357 ft
Pentax AD 8x25 WP288 ft

8x25 binoculars by field of view at 1,000 yd, widest first, from the makers' figures.

AD 8x25 WP and its nearest rivals

AD 8x25 WP next to the 8x25 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 AD 8x25 WP	288 ft	21 mm	9.8 ft	10.6 oz	3.1 mm	$100 to $200
Nikon ProStaff 8x25 ATB	330 ft	15.5 mm	9.2 ft	12.5 oz	3.1 mm	$100 to $200
Hawke Nature-Trek Compact 8x25	356 ft	13 mm	6.6 ft	10.4 oz	3.1 mm	$100 to $200	Check price on Amazon
Nikon Trailblazer 8x25 ATB	429 ft	10 mm	8.2 ft	9.9 oz	3.1 mm	$100 to $200

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Pentax binoculars

AD 8x25 WP questions

AD 8x25 WP: does it work with glasses?

AD 8x25 WP has 21 mm of eye relief, which meets the 16 mm the RSPB advises for people who wear glasses.

AD 8x25 WP: what does 8x25 mean?

AD 8x25 WP magnifies 8 times through 25 mm front lenses, which works out to an exit pupil of 3.1 mm, the width of the beam of light that reaches each eye.

AD 8x25 WP: how wide is the view?

AD 8x25 WP shows a view 288 ft wide at 1,000 yd, below the 357 ft median of the 21 8x25 models in the chart.