The Vixen GL40 40x/53x Spotting Scope Eyepiece is designed for use with Vixen Geoma spotting scopes with 67mm or 82mm objective lenses.This awesome spotting scope eyepiece has fully multicoated optics, a high range magnification and a wide field of view, allowing you to immerse in your environment.Your GL40 can be easily exchanged with other Vixen eyepieces whilst out in the field without disturbing wildlife.Specifications:- Magnification: 40x with 67mm scopes, 53x with 82mm scopes- Angle of view: 1.6 with 67mm scopes, 1.2 with 82mm scopes- Field of view: (@ 1000m) - 28m- Exit pupil diameter: 1.7mm with 67mm scopes, 1.5mm with 82mm scopes- Eye relief: 16mm- Relative brightness: 2.9 with 67mm scopes, 3.4 with 82mm scopes- Twilight factor: 52 with 67mm scopes, 66 with 82mm scopes- Weatherproofing: None- Dimensions(WxH): 76 x 33mm- Weight: 75gIn the Box:1x Vixen Spotting Scopes Eyepiece GL40 (Wide)Model: VX1830