2. All-optical blue film coating, with strong permeability and high-definition multilayer FMC blue film coating, 1. Size: 180*60*140MM, objective lens diameter: 35MM, exit pupil di: 20MM, field of view: 87M/1000M, 4. Rough and solid focusing wheel, surface anti-skid vertical bar design. Effectively increase the friction with the focusing wheel, focusing is more comfortable and convenient, 3. Anti-slip ring protection leather, high-quality natural environmental protection rubber protection skin, dte anti-slip texture, comfortable grip, Particularly suitable for outdoor activities such as mountaineering, hiking, driving, wildlife viewing and scenic appreciation.