Dedicated eyepiece for use with specific Nikon EDG Fieldscopes. Delivers bright, clear images at 50x magnification when attached to an EDG Fieldscope model with an 85 mm objective lens, and at 40x magnification when attached to a model with a 65 mm objective lens. Features a bayonet-type mount with lock for quick and secure attachment to the Fieldscope and a turn-and-slide eyecup that makes it easy to position your eye at the correct eyepoint.