Aimed at the entry level users the nikon fieldscope 60 prostaff 5 straight spotting scopes is the successor of the popular nikon ra iii series and 20 lighter the 60 prostaff spotting scope features a large 62mm objective lens for a clear bright field of view suitable for all environments the scope is waterproof up to 1m for 10 minutes and fog free with o ring seals and nitrogen gas in the main body the newly designed zoom eyepiece lens minimises colour aberration at the edge of field of v