Dedicated eyepiece for use with specific Nikon EDG Fieldscopes. Delivers bright, clear images at 20x magnification when attached to a model with an 85 mm objective lens, and at 16x magnification when attached to one 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.