14
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SPECIFICATIONS
Type
Roof-prism central focusing type
Model
ACULON W10 8×21
ACULON W10 10×21
Magnification
(×)
8 ×
10 ×
Effective diameter of objective lens
(mm)
21
21
Real field of view
(°)
6.3
5.0
Angular field of view (apparent)
(°)*
47.5
47.2
Field of view at 1,000m
(ft)
(m)
331
110
262
87
Exit pupil
(mm)
2.6
2.1
Relative brightness
6.8
4.4
Eye relief
(mm)
10.3
8.3
Close focusing distance
(ft)**
(m)**
9.8
3.0
9.8
3.0
Length (in)
(mm)
3.4
87
3.4
87
Width (in)
(mm)
4.3
110
4.3
110
Thickness (in)
(mm)
1.3
34
1.3
34
Weight (oz)
(g)
7.6
215
7.6
215
Interpupillary distance adjustment
(mm)
56-72
56-72
Structure
Waterproof (up to 1 meter for 10 minutes) and nitrogen gas filled
*
The number calculated by the formula [tan ω’= Γ x tan ω]
Apparent field of view: 2 ω’, Magnification: Γ, Real field of view: 2 ω
** With normal eyesight without accommodation