Nikon Travelite VI 10x25 Brochure page 48

Binoculars
Binocular Accessories
Tripod/monopod adaptors
Usable models
• Action series
• Action zoom series
• Action EX series
• 7x50CF WP/7x50CF WP
Compass
• 7x50IF WP/7x50IF WP
Compass
• 10x50CF WP
Usable models
• 7x50IF HP WP Tropical
• 8x32SE CF/10x42SE
CF/12x50SE CF
• 18x70IF WP WF
• 7x50IF SP WP/10x70IF SP
WP
• 10x70IF HP WP
• 8x30E II/10x35E II
Usable models
• EDG binoculars
• 8x42HG L DCF
• 10x42HG L DCF
• 8x32HG L DCF
• 10x32HG L DCF
• MONARCH series
• MONARCH X series
(soft type only)
• SPORTER EX series
(soft type only)
Soft (S) type
TRA-3
Usable models
• EDG binoculars
• MONARCH series
• Action series
• Action zoom series
• Action EX series
• 7x50CF WP/7x50CF WP Compass
• 7x50IF WP/7x50IF WP Compass
• 10x50CF WP
Values for Apparent Field of View
With the conventional method used previously, the apparent field of view was calculated by
multiplying the real field of view by the binocular magnification. After revision, Nikon's
figures are now based on the ISO 14132-1:2002 standard, and obtained by the following
formula:
tan ω' = x tan ω
Γ
Apparent field of view: 2ω'
Real field of view: 2ω
Magnification:
Γ
For example, the apparent field of
view of 8x binoculars with an 8.8°
Hard (H) type
real field of view is as follows:
2ω' = 2 x tan -
1 ( x tan ω)
Γ
= 2 x tan -
1 (8 x tan 4.4°)
= 63.2°
Referring to the ISO 14132-2:2002 standard that was established at the same time as the
abovementioned ISO 14132-1:2002, binoculars that provide an apparent field of view over 60˚
are considered wide-viewfield binoculars.
48
1,000m
125m
Γ=8
2ω' = 63.2° 2ω = 8.8°