Nikon 20X Spotting Scope Eyepiece. You can convert your spotting scope into a powerful long-range lens for your COOLPIX camera with the Nikon 6978 Eyepiece. This Nikon Eyepiece keeps your view crystal clear and razor sharp with its fully multi-coated lenses. The Nikon 20x Eyepiece is fully waterproof and nitrogen purged. Specifications for Nikon ProStaff 20x Spotting Scope Eyepiece: Magnification x (with PROSTAFF 5 Fieldscope 82): 20 Magnification x (with PROSTAFF 5 Fieldscope 60): 25 Real Field of View degree (with PROSTAFF 5 Fieldscope 82): 2.8 Real Field of View degree (with PROSTAFF 5 Fieldscope 60): 2.2 Apparent Field of View degree: 51.3 Exit Pupil mm (with PROSTAFF 5 Fieldscope 82): 3.0 Exit Pupil mm (with PROSTAFF 5 Fieldscope 60): 3.3 Brightness (with PROSTAFF 5 Fieldscope 82): 9.0 Brightness (with PROSTAFF 5 Fieldscope 60): 10.9 Eye Relief mm: 17.6 Field of View at 1000m m (with PROSTAFF 5 Fieldscope 82): 58 Field of View at 1000m m (with PROSTAFF 5 Fieldscope 60): 72 Coating: Fully multilayer coated Length mm: 59 Outside Diameter mm: 63 Waterproofness: Filled with nitrogen gas. Up to 2m under water for 10 min. The joint between the body and eyepiece is water-resistant. Mount: Bayonet Eyecup: New Turn-Slide Compatibility with FSB series (Digiscoping): Yes Features of Nikon SEP25 Eyepiece: Bayonet mount with lock for easy attachment and release. Fully multi-layer coated Water resistance Long eye relief Turn-slide eyecups - for DS in case turn-slide is pulled in for adjustable eye relief in case turn-slide is pulled out. Package Contents: Nikon SEP-25 Eyepiece for ProStaff Spotting Scopes Nikon 20X Spotting Scope Eyepiece