Fujinon KF 10x42 specs and field of view

A 315 ft field at 1,000 yd places this model 67th of 87 in its size, against a median of 336 ft. It weighs 23.6 oz.

Field of view: 315 ftat 1,000 yd
Eye relief: 13 mm
Weight: 23.6 oz
Exit pupil: 4.2 mmcalculated

Why pick it

23.6 oz, lighter than the typical 24.9 oz

KF 10x42: width of view at 1,000 yd, against the median of the 87 10x42 models.

Who the KF 10x42 suits

A weight of 23.6 oz sits under the 24.9 oz median for the size, and the calculated exit pupil of 4.2 mm suits daytime and early evening use.

Its 13 mm eye relief is below the 16 mm median, and no close focus figure is printed in the makers' documents.

KF 10x42 or another model: the best binoculars by maker figures shows how the popular ones differ. KF 10x42 is one of 87 models in the 10x42 binoculars comparison.

KF 10x42 specifications

KF 10x42 figures as Fujinon prints them; rows marked * are calculated from the 10x42 size.

KF 10x42 specifications
Magnification	10x
Objective lens	42 mm
Field of view	315 ft at 1,000 yd (105 m at 1,000 m)
Angular field of view	6°
Apparent field of view	60° *
Eye relief	13 mm
Weight	23.6 oz (670 g)
Exit pupil	4.2 mm *
Twilight factor	20.5 *
Relative brightness	17.6 *

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

KF 10x42 against other 10x42 binoculars

KF 10x42 shows 315 ft at 1,000 yd, below the 336 ft median of the 87 10x42 models in the chart. At 23.6 oz it is at or under the 24.9 oz median weight for the size.

Kowa SV III 10x42400 ft
Swarovski NL Pure 10x42399 ft
Bushnell R5 10x42390 ft
Minox X-PRO 10x42390 ft
Kowa BD III 10x42 XD378 ft
Hawke Frontier APO 10x42372 ft
Nikon Prostaff P3 10x42367 ft
Nikon Prostaff P7 10x42367 ft
Hawke Frontier ED X Gen 2 10x42367 ft
GPO Passion HD 10x42366 ft
Nikon Monarch HG 10x42363 ft
Fujinon KF 10x42315 ft

10x42 binoculars by field of view at 1,000 yd, widest first, from the makers' figures.

KF 10x42 and its nearest rivals

KF 10x42 next to the 10x42 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	Amazon
Fujinon KF 10x42	315 ft	13 mm		23.6 oz	4.2 mm
ZEISS Victory SF 10x42	360 ft	18 mm	4.9 ft	27.8 oz	4.2 mm
Canon 10x42 L IS WP	342 ft	16 mm	8.2 ft	39.2 oz	4.2 mm
ZEISS Terra ED 10x42	330 ft	14 mm	5.3 ft	25.6 oz	4.2 mm	Check price on Amazon

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Other sizes of the KF

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

Model	Size	Field of view	Eye relief	Weight	Exit pupil	Amazon
Fujinon KF 10x42	10x42	315 ft	13 mm	23.6 oz	4.2 mm
Fujinon KF 8x25	8x25	351 ft	15 mm	13.4 oz	3.1 mm
Fujinon KF 10x25	10x25	294 ft	15 mm	13.4 oz	2.5 mm
Fujinon KF 8x32	8x32	396 ft	14.5 mm	19 oz	4 mm	Check price on Amazon
Fujinon KF 10x32	10x32	341 ft	14.5 mm	19.8 oz	3.2 mm	Check price on Amazon
Fujinon KF 8x42	8x42	393 ft	15 mm	23.6 oz	5.3 mm

Fujinon binoculars

KF 10x42 questions

KF 10x42: does it work with glasses?

KF 10x42 has 13 mm of eye relief, well short of the 16 mm the RSPB advises for people who wear glasses.

KF 10x42: what does 10x42 mean?

KF 10x42 magnifies 10 times through 42 mm front lenses, which works out to an exit pupil of 4.2 mm, the width of the beam of light that reaches each eye.

KF 10x42: how wide is the view?

KF 10x42 shows a view 315 ft wide at 1,000 yd, below the 336 ft median of the 87 10x42 models in the chart.