| Magnification |
10x |
12x |
15x |
18x |
| Obj. lens diameter |
56mm |
56mm |
56mm |
56mm
|
| Exit pupil |
5.6mm |
4.7mm |
3.7mm |
3.1mm |
|
Field of View (FOV)
|
6.5°
|
5.5°
|
4.5°
|
3.7°
|
| Apparent FOV (FOV x Power) |
65°
|
66°
|
67.5°
|
66.6°
|
| Field of view (ft/1000 yds) |
341 |
289 |
236 |
194 |
| Brightness |
31.4 |
21.8 |
13.9 |
9.6 |
| Light transmission (%) |
92.80%
|
92.60%
|
92.50% |
92.70% |
| Twilight factor |
23.7 |
25.9 |
29 |
31.7 |
| Multi Position Eyecups Y/N |
Yes |
Yes |
Yes |
Yes
|
| Eye relief |
19mm |
17.4mm |
17.8mm |
18mm |
| Near focus |
9.8ft |
9.8ft |
9.8ft |
9.8ft |
| Eye width adjustment |
56~75mm
|
56~75mm
|
56~75mm |
56~75mm
|
| Dimension WxHxD |
6.1x8.2x2.6
|
6.1x8.2x2.6
|
6.1x8.2x2.6 |
6.1x8.2x2.6
|
| Weight |
45 oz |
45 oz |
45 oz |
45 oz |
| Lens constr. obj. |
3 groups 4 elements |
3 groups 4 elements
|
3 groups 4 elements |
3 groups 4 elements
|
| Lens constr. ocular |
4 groups 5 elements |
4 groups 6 elements |
4 groups 6 elements |
4 groups 6 elements |
| Prisms type |
Abbe-Koenig
|
Abbe-Koenig
|
Abbe-Koenig |
Abbe-Koenig
|
| Prism reflective coating type |
N/A
|
N/A
|
N/A |
N/A |
| Phase Correction Coating |
Yes |
Yes |
Yes |
Yes |
| ED glass |
Fluorite
|
Fluorite
|
Fluorite
|
Fluorite
|
| Lens coating |
Scratch and Oil Resistant
|
Scratch and Oil Resistant
|
Scratch and Oil Resistant |
Scratch and Oil Resistant
|
| Diopter correction (dpt) |
more than +/-2
|
more than +/-2
|
more than +/-2 |
more than +/-2
|
| Pressure tested to what pressure |
1m for 30 min. (IPX7)
|
1m for 30 min. (IPX7)
|
1m for 30 min. (IPX7) |
1m for 30 min. (IPX7)
|
| Storage temperature |
-40°~158°F
|
-40°~158°F
|
-40°~158°F
|
-40°~158°F
|
| Functional temperature |
-13°~140°F
|
-13°~140°F
|
-13°~140°F
|
-13°~140°F
|
| Frame material |
Magnesium
|
Magnesium
|
Magnesium |
Magnesium |
| Internal gas purged |
Nitrogen
|
Nitrogen
|
Nitrogen |
Nitrogen
|
| Tripod Adaptable Y/N |
Yes
|
Yes
|
Yes |
Yes |
| Origin |
Japanese components assembled in the US
|
Japanese components assembled in the US
|
Japanese components assembled in the US |
Japanese components assembled in the US
|
