Dedicated eyepiece for use with specific Nikon PROSTAFF 5 Fieldscope 20-60x Magnification with PROSTAFF 5 Fieldscope 60. 16-48x Magnification with PROSTAFF 5 Fieldscope 82. Fully Multi-layer Coated. Water Resistant. Designed for digiscoping with selected COOLPIX cameras. Bayonet mount with lock for easy attachment and release. Long Eye Relief.