Nikon FEP-75W is a dedicated eyepiece for use with specific Nikon EDG Fieldscopes. Delivers bright, clear images at 75x magnification when attached to a model with an 85 mm objective lens, & at 60x magnification when attached to one with a 65 mm objective lens. The eyepiece features a bayonet-type mount with lock for quick & secure attachment to the Fieldscope & a turn-&-slide eyecup that makes it easy to position your eye at the correct eyepoint. Bayonet mount with lock for quick & secure attachment. Multilayer coated lenses reduce internal reflections & flare to deliver superior light transmission for sharp, clear views. Aspherical lens elements for bright, clear images with well-balanced color & minimal distortion. Waterproof (up to 2 meters for 10 minutes) & fog-proof, with O-ring seals & nitrogen gas. Turn-&-slide eyecup with multi-click system makes it easy to position your eye at the correct eyepoint Compatible with specific Fieldscope FEP Eyepiece Mount Adapters.