Porro Prisms, Wide-Angle FOV, Multi-Coated Optics, Zoom Lever

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The UpClose G2 7-21x40 Zoom Porro Binocular (Clamshell Packaging) from Celestron is a nifty and neatly compressed binocular into a concise ergonomic form factor. The classic Porro prism design lays out better three-dimensional imaging with less light loss. Zoom magnification from 7x to 21x is smoothly exercised via the convenient side-placed ridged thumb lever. This binocular possesses multi-coated optics for brighter, sharper, higher contrasted viewing with very reasonable light transmission of the 40 millimetre objectives. It boasts an exceptionally wide-angle AAoV of 67.2 degrees at 21x magnification. The outdoor factor has not been ignored. Water resistant with rubber covered aluminium housing, it is endowed with finger ridges and thumb indents. It's easy to hold and hard to put down. The rubber eyecups and the dioptric adjustment furnish individualised settings making its use more comfortable. The G2 7-21x40 Zoom binocular offers a moderately small size factor but is nevertheless provided with a tripod thread for long term viewing.

Key Features

  • Wide AAoV of 67.2° at 21x
  • Large ridged centre focus wheel affords easily accessible focusing
  • Zoom lever provides fast and continuous movement from 7x to 21x and back again
  • Rubber eyecups and right eye dioptric adjustment supply comfortable customised viewing
  • Porro Prisms offer enhanced three-dimensional imaging, less light loss and generally sharper images for a smaller investment
  • Rubber covered aluminium body with ergonomic thumb indents and finger ridges provide a secure and comfortable grip, as well as added shock-resistance
  • BAK7 glass with multi-coated optics on at least one lens surface reduces light loss and glare due to reflection offering a brighter, higher-contrast image
  • Celestron recommends this binocular for bird watching, sporting events, nature & wildlife, hunting, travel & ventures, concerts & live events, and boating


Prism Type
Objective Lens Diameter
Angle of View
7x: 5.3°
21x: 3.2°
7x: 279' @ 1000 yd / 92.63 m @ 1000 m
21x: 168' @ 1000 yd / 55.78 m @ 1000 m
Minimum Focus Distance
26' / 7.92 m
Please Note:
@ 7x
45' / 13.7 m @ 21x
Exit Pupil Diameter
7x: 3  mm
21x: 1.9  mm
Eye Relief
12  mm
Interpupillary Adjustment
56 - 72 mm / 2.20 - 2.83"
Dioptric Correction
Not Specified By Manufacturer
Focus Type
Tripod Mount
6.8 x 5.4 x 2.9" / 17.27 x 13.72 x 7.37  cm
27 oz / 765 g
Celestron UpClose G2 7-21x40 Zoom Porro Binocular (Clamshell Packaging)
RM Product #: