Binocular Chart

Nikon Action EX 8x40 CF specs and field of view

The Action EX 8x40 CF is a porro prism design with a 429 ft field of view, level with the size median, and a calculated 5 mm exit pupil. The maker rates it for up to 1 m / 3.3 ft for 5 minutes, with nitrogen fogproofing.

Field of view
429 ftat 1,000 yd
Eye relief
17.2 mm
Close focus
16.4 ft
Weight
30.2 oz
Exit pupil
5 mmcalculated

Why pick it

  • 17.2 mm eye relief, enough for glasses
  • Waterproof
  • Takes a tripod adapter
Action EX 8x40 CF: width of view at 1,000 yd, against the median of the 6 8x40 models.
Action EX 8x40 CF: width of view at 1,000 yd, against the median of the 6 8x40 models.

Who the Action EX 8x40 CF suits

Open country and dusk viewing suit it, with 17.2 mm eye relief for eyeglass wearers. A tripod adapter fits when you want a steady view at length.

At 30.2 oz it is a heavy carry for 8x40, and the 16.4 ft close focus rules out near subjects.

Action EX 8x40 CF can be set against the most popular models of every size in the best binoculars list. Action EX 8x40 CF is one of 6 models in the 8x40 binoculars comparison.

Action EX 8x40 CF specifications

Action EX 8x40 CF figures as Nikon prints them; rows marked * are calculated from the 8x40 size.

Action EX 8x40 CF specifications
Magnification8x
Objective lens40 mm
Prism typePorro
Field of view429 ft at 1,000 yd (143 m at 1,000 m)
Angular field of view8.2°
Apparent field of view59.7°
Eye relief17.2 mm
Close focus16.4 ft (5 m)
Eye spacing range56 to 72 mm
Weight30.2 oz (855 g)
Length5.4 in (138 mm)
Width7.4 in (187 mm)
WaterproofingUp to 1 m / 3.3 ft for 5 minutes
Fog-proofing gasNitrogen
Tripod adaptableYes
Focus systemCenter focus
Exit pupil5 mm *
Twilight factor17.9 *
Relative brightness25 *

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

Action EX 8x40 CF against other 8x40 binoculars

Action EX 8x40 CF shows 429 ft at 1,000 yd, at or above the 429 ft median of the 6 8x40 models in the chart. At 30.2 oz it is heavier than the 25.6 oz median for the size.

8x40 binoculars by field of view at 1,000 yd, widest first, from the makers' figures.

Action EX 8x40 CF and its nearest rivals

Action EX 8x40 CF next to the 8x40 models closest to it in maker list price, with the best figure in each column in bold.

ModelField of viewEye reliefClose focusWeightExit pupilMaker list priceAmazon
Nikon Action EX 8x40 CF 429 ft 17.2 mm 16.4 ft 30.2 oz 5 mm
Pentax SP 8x40 429 ft 13 mm 20 ft 27.2 oz 5 mm Check price on Amazon
ZEISS Victory SFL 8x40 420 ft 18 mm 4.9 ft 22.6 oz 5 mm
Pentax SP 8x40 WP 330 ft 20 mm 11.5 ft 31.7 oz 5 mm

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Other sizes of the Action EX

Nikon makes the Action EX in 6 sizes; a larger front lens adds brightness and weight, and more magnification narrows the view.

ModelSizeField of viewEye reliefClose focusWeightExit pupil
Nikon Action EX 8x40 CF 8x40 429 ft 17.2 mm 16.4 ft 30.2 oz 5 mm
Nikon Action EX 7x35 CF 7x35 489 ft 17.3 mm 16.4 ft 28.2 oz 5 mm
Nikon Action EX 7x50 CF 7x50 336 ft 17.1 mm 23 ft 35.3 oz 7.1 mm
Nikon Action EX 10x50 CF 10x50 342 ft 17.2 mm 23 ft 36 oz 5 mm
Nikon Action EX 12x50 CF 12x50 288 ft 16.1 mm 23 ft 36.9 oz 4.2 mm
Nikon Action EX 16x50 CF 16x50 183 ft 17.8 mm 23 ft 36.7 oz 3.1 mm

Nikon binoculars

Action EX 8x40 CF questions

Action EX 8x40 CF: does it work with glasses?

Action EX 8x40 CF has 17.2 mm of eye relief, which meets the 16 mm the RSPB advises for people who wear glasses.

Action EX 8x40 CF: what does 8x40 mean?

Action EX 8x40 CF 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.

Action EX 8x40 CF: how wide is the view?

Action EX 8x40 CF shows a view 429 ft wide at 1,000 yd, at or above the 429 ft median of the 6 8x40 models in the chart.

Action EX 8x40 CF: can it go on a tripod?

Action EX 8x40 CF is tripod adaptable according to Nikon, so it accepts a binocular tripod adapter.