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Binoculars
The Standard for advanced Nature Observation
Model name
10x70IF SP WP
Magnification (x)
10
Objective diameter (mm)
70
Angular field of view (Real/degree)
5.1
Angular field of view (Apparent/degree)
48.0
Field of view at 1,000m (m)
89
Exit pupil (mm)
7.0
Relative brightness
49.0
Eye relief (mm)
16.3
Close focusing distance (m)
25.0
Interpupillary distance adjustment (mm)
56-72
Weight (g)
2,100
Length (mm)
304
Width (mm)
234
Type
Porro
Binocular accessories
Tripod/monopod adaptors
Usable models
Usable models
• Action series
• 8x42HG L DCF
• Action zoom series
• 10x42HG L DCF
• Action EX series
• 8x32HG L DCF
• 7x50CF WP/7x50CF WP
• 10x32HG L DCF
Compass
• MONARCH series
• 7x50IF WP/7x50IF WP
• MONARCH X series
Compass
(soft type only)
• 10x50CF WP
• SPORTER EX series
(soft type only)
Soft (S) type
Usable models
Tra-3
• 7x50IF HP WP Tropical
Usable models
• 8x32SE CF/10x42SE
• MONARCH series
CF/12x50SE CF
• Action series
• 18x70IF WP WF
• Action zoom series
• 7x50IF SP WP/10x70IF SP
• Action EX series
WP
• 7x50CF WP/7x50CF WP Compass
• 10x70IF HP WP
• 7x50IF WP/7x50IF WP Compass
• 8x30E II/10x35E II
• 10x50CF WP
18x70IF WP WF
18
70
4.0
64.3
70
3.9
15.2
15.4
81.0
56-72
2,050
293
234
Porro
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' = τ x tan ω
Apparent field of view: 2ω'
1,000m
Real field of view: 2ω
Magnification: τ
125m
For example, the apparent field of
2ω' = 63.2°
view of 8x binoculars with an 8.8°
Hard (H) type
real field of view is as follows:
2ω' = 2 x tan -
(τ x tan ω)
1
= 2 x tan -
(8 x tan 4.4°)
1
= 63.2°
Referring to the ISO 14132-2:2002 standard that was established at the same time as the
abovementioned ISO 14132-1:2002, Nikon has determined that wide-viewfield binoculars
must provide an apparent field of view over 60°.
44
Scopes
EDG Fieldscope 65
EDG Fieldscope 65-A
EDG Fieldscope 85
τ=8
2ω = 8.8°
EDG Fieldscope 85-A
Note: Nikon has adopted a calculation method based on ISO 14132-1:2002, and therefore, values for
the apparent field of view have changed from those previously stated. For details, see page 44.
Model name
Objective diameter
Length
Width
Weight
(mm)
(mm)*
(mm)*
(g)*
EDG Fieldscope 65
65
313
88
1,560
EDG Fieldscope 65 A
65
332
88
1,620
EDG Fieldscope 85
85
379
102
2,030
EDG Fieldscope 85 A
85
398
102
2,030
*Body only
eyepieces for eDg fieldscopes
Magnifi-
Angular field of
Angular field of
Field of view
Exit pupil
Model name
cation (x)
view (Real/
view (Apparent/
at 1,000m (m)
(mm)
degree)
degree)
(approx.)
FEP-20W
With EDG 65/65-A
16
4.1
60.0
72
4.1
With EDG 85/85-A
20
3.3
60.0
58
4.3
FEP-30W
With EDG 65/65-A
24
3.0
64.3
52
2.7
With EDG 85/85-A
30
2.4
64.3
42
2.8
FEP-38W
With EDG 65/65-A
30
2.4
64.3
42
2.2
With EDG 85/85-A
38
1.9
64.3
33
2.2
FEP-50W
With EDG 65/65-A
40
1.8
64.3
31
1.6
With EDG 85/85-A
50
1.4
64.3
24
1.7
FEP-75W
With EDG 65/65-A
60
1.2
64.3
21
1.1
With EDG 85/85-A
75
1.0
64.3
17
1.1
FEP-25 LER
With EDG 65/65-A
20
3.0
55.3
52
3.3
With EDG 85/85-A
25
2.4
55.3
42
3.4
FEP-20-60
With EDG 65/65-A
16-48
2.8 (at 16x)
42 (at 16x)
47 (at 16x)
4.1 (at 16x)
With EDG 85/85-A
20-60
2.2 (at 20x)
42 (at 20x)
38 (at 20x)
4.3 (at 20x)
* With detachable turn-and-slide eyecup
45
Relative
Eye relief
Weight
brightness
(mm)
(g)
16.8
20.1
240
18.5
20.1
240
7.3
25.4
390*
7.8
25.4
390*
4.8
17.9
230
4.8
17.9
230
2.6
17.8
230
2.9
17.8
230
1.2
17
230
1.2
17
230
10.9
32.3
320
11.6
32.3
320
16.8 (at 16x)
18.4 (at 16x)
330
18.5 (at 20x)
18.4 (at 20x)
330
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