The Eyepiece is designed to seal out stray light for improved viewfinder optics. Made of soft TPU rubber, it protects your eyes from scratches, especially for eyeglass users. The eyepiece adopts an ergonomic oval shape to fit your eyes better. Besides, the eyepiece is 360º rotatable, so you can adjust it for horizontal or vertical view. 
 
Product Highlights
Seals out stray light for improved viewfinder optics
Soft TPU rubber allows for eye comfort, especially for eyeglass users
Ergonomic oval shape is designed to fit your eyes better
Rotates 360º for horizontal or vertical view
Replaces Nikon DK-20/DK-21/DK-23/DK-24/DK-25 eyepieces
 
Eye Cup For Nikon Square Eyepieces,
Compatible Cameras：
Nikon D7500
Nikon D300, D300s, D5000 SLR Digital Cameras
Nikon D610, D7000, D90, and D80 DSLRs
Nikon FM10, D50, D60, D70s, D3100, D3000
Nikon D3300, D3400, D5500, D5100, D3200, D750, D610, D600, D5200, D7100, D7200, D5300, D5600, D3500, etc