10-40x28 15-60x28 18-100x28

Key Features ：
● BK7 Reverse-Porro Prisms
● Compact Reverse Porro Prism Design
● Fully Multi-Coated Optics
● Exceptionally Wide Zoom Range
● Fold-Down Rubber Eyecups
● Center Focus Knob
Overview ：
The 20-80x28 Zoom Binoculars from are designed for long distance terrestrial  viewing.   The variable magnification range of the binoculars allow the viewer to scan a large field of view and then zoom in on the selected object for a closer and greater detailed look. A zoom thumb-lever for making quick and smooth magnifications is featured.  Zoom 20-80x magnification, 28mm objective lenses, and an included tripod adaptor for a steady view, contribute to binoculars that are ideal for all outdoor activities and sporting events.
Optical Performance:
● Wide 20-80x zoom range
● 28 mm objective lenses
● Compact reverse-Porro prism design
● Multi-Coated  optics ensure images are bright and clear with improved contrast and accurate color representation

● Wide 34°- 56°apparent angle of view
● 90 ft(20x) to 36.6 ft (80x) foot field of view at 1000 yards
Use and Handling ：
● Large center focusing wheel is easy to manipulate, even when wearing gloves
● Right-eye dioptric correction enables users to compensate for individual optical prescription

● Fold-Down  rubber eyecups for comfortable use with or without eyewear
● Close 5' short-focus distance
● 1.4 - 0.35 mm exit pupil
● 10.5 - 6.5 mm eye relief
Construction Details： 
● Lightweight plastic chassis
● Protective black rubber armor provides a slip-resistant grip
● Textured palm pads improve grip security
● Weight: 350 g
Performance ：