B.4 - 10x56 / 12x56
The Maven B.4 Binocular was designed to pick up where the B.2 leaves off and is built as an alternative to low to mid-powered spotting scopes. Built with a larger than typical ocular eyepiece, the B.4 offers a broader viewing area for when dimly-lit situations call for extra light and extra magnification. The B.4 is a large objective optic and is our recommended optic for hunters and birders who prefer to glass with a tripod setup.
The B.4 also features tack-sharp edge-to-edge clarity, generous depth of field, and a silky focus mechanism. Additionally, the split frame design gives this larger objective optic a lighter weight chassis all while maintaining durability.
The Maven B Series represents our elite line of optics, designed to fit your specific needs, delivered for a fraction of comparable binoculars’ costs and stacks up with the most celebrated and expensive binoculars in the world. Whether you choose a stock color unit or configure your own custom-built optic, our modern sportsman-inspired designs are paired with the best available materials and state of the art technology to create an uncompromising optic.
Includes neoprene neck strap, lens caps and double-layered microfiber storage bag.
| Magnification | 10x | 12x |
| Obj. lens diameter | 56mm | 56mm |
| Exit pupil | 5.6mm | 4.7mm |
| FOV | 6.7° | 5.5° |
| Apparent FOV (FOV x Power) | 67° | 66° |
| Field of view (ft/1000 yds) | 351.8 |
288.8 |
| Brightness | 31.4 |
21.8 |
| Light transmission (%) | 93.70% | 94.20% |
| Twilight factor | 23.7 |
25.9 |
| Multi Position Eyecups Y/N | Yes | Yes |
| Eye relief | 17mm | 18mm |
| Near focus | 9.8ft | 9.8ft |
| Eye width adjustment | 56~74mm | 56~74mm |
| Dimension WxHxD | 6.1x8.2x2.7 |
6.1x8.2x2.8 |
| Weight | 48 oz | 48 oz |
| Lens constr. obj. | 3 groups 4 elements (ED) | 3 groups 4 elements (ED) |
| Lens constr. ocular | 4 groups 5 elements | 5 groups 6 elements |
| Prisms type | Abbe-Koenig |
Abbe-Koenig |
| Prism reflective coating type | N/A |
N/A |
| ED glass | Yes | Yes |
| Lens coating | Scratch and Oil Resistant | Scratch and Oil Resistant |
| Diopter correction (dpt) | +/-2 | +/-2 |
| Pressure tested to what pressure | 1m for 30 min. (IPX7) | 1m for 30 min. (IPX7) |
| Storage temperature |
-40°~158°F |
-40°~158°F |
| Functional temperature | -13°~140°F | -13°~140°F |
| Frame material | Polymer |
Polymer |
| Internal gas purged | Nitrogen | Nitrogen |
| Tripod Adaptable Y/N | Yes | Yes |
| Origin | Japanese components assembled in the US | Japanese components assembled in the US |