At a glance - Compatible with Vixen Geoma spotting scopes - Multi-coated lens Specifications: Model: VX1828 - Magnification: 14x with 52mm scopes, 20x with 67mm scopes, 27x with 82mm scopes - Angle of View: 3.7 with 52mm scopes, 2.6 with 67mm scopes, 1.9 with 82mm scopes - Field-of-View (@ 1000 Yds): 196' (65 m @ 1000 m) with 52mm scopes, 136' (45 m @ 1000 m) with 67mm scopes, 102' (34 m @ 1000 m) with 82mm scopes - Exit Pupil: 3.7mm with 52mm scopes, 3.3mm with 67mm scopes, 3.0mm with 82mm scopes - Eye Relief: 19mm - Relative Brightness: 13.8 with 52mm scopes, 11.2 with 67mm scopes, 9.2 with 82mm scopes - Twilight Factor: 27.0 with 52mm scopes, 36.6 with 67mm scopes 47.1 with 82mm scopes - Weatherproofing: None - Dimensions: 1.3 x 1.7 Inch (33 x 42mm) W x H - Weight: 0.11 lb (50g)