7-21x40 8-24x50 10-30x50

Key Features:
● Levered Zoom Magnification
● Traditional BK7 Porro Prisms
● Anti-Reflection Multi-Coated Ruby Optics
● Large Center Focusing Wheel
● Tripod Mountable with Optional Adapter
● Fold-Down Rubber Eyecups
Overview:
The 10-30x50mm  Zoom Binoculars are designed for long-distance terrestrial and astronomical viewing. The powerful variable magnification range allows the viewer to scan a large field of view and then zoom in on the selected object to make detailed observations. An ergonomically-placed zoom lever allows users to make fast magnification changes while viewing through the eyepieces with a simple movement of their right index or middle finger. The large objectives and  multi-coatings draw in copious amounts of light to push the low-light capabilities of the optic, while a large exit pupil at low magnification ensures complete coverage of the user's pupil when it gets fully dilated as light fades.
Fold-down eyecups enable comfortable viewing with or without eyewear, and rubber armoring provide a slip-resistant grip.  For long-duration glassing sessions or when keeping the binoculars steady at high magnifications, they can be tripod mounted using an optional adapter. 
Optical Performance：
● Powerful 10-30x zoom magnification range
● Large 50mm objective lenses
● Traditional BK7 Porro prism design
● Anti-reflection multi-coated optics limit light loss and enhance contrast and color rendition
● 195' field of view at 1000 yards at 10x power
● Large 5mm exit pupil, at 10x, helps to avoid vignetting in low-light when pupils become dilated
Use and Handling：
● Convenient, ergonomically-placed zoom lever is easy to manipulate with right index or middle finger while looking through the binoculars
● Zoom indicators on right ocular clearly shows selected magnification for repeatability
● Large center focusing wheel
● Right-eye dioptric correction
● Fold-down rubber eyecups for comfortable use with or without eyewear
Construction Details：
● Nonreflective matte-black finish
● Protective rubber armoring provides a slip-resistant grip
● Tripod mountable with optional adapter
● Weight: 824 g
Performance:

Model：	BMZ1142	BMZ1142	BMZ1142
Specification	7-21x40mm	8-24x50mm	10-30x50mm
Magnification	7x - 21x	8x - 24x	10x - 30x
Obj.lens (mm)	40 mm	50 mm	50 mm
Field Angle	5.2°- 2.9°	4.5° - 2.5°	3.6° - 1.9°
Field of View @ 1000m	90m - 50m	78m - 43m	64m - 33m
Field of View @ 1000yds	270 ft - 150 ft	234 ft - 129ft	192ft - 99ft
Apparent Field of View	36° - 61°	36° - 60°	36° - 57°
Exit pupil (mm)	5.7 - 1.9	6.0 - 2.0	5.0 - 1.6
Eye relief (mm)	14 - 12 mm	14.5 - 12.5 mm	14.5 - 12.5 mm
Closest Distance	10 m	10 m	10 m
Diopter Adjustment	±4	±4	±4
Prism System	Porro	Porro	Porro
Prism Glass	Bk7	Bk7	Bk7
Focus System	Center	Center	Center
Lens Coating	Fully Multi	Fully Multi	Fully Multi
Eyecups	Fold-Down	Fold-Down	Fold-Down
Size (mm)	185X52X144	195X52X180	195X52X180
Weight (g)	687 g	824 g	824 g