Eyepieces with optical glass and a eyecup which replaces Nikon DK-19:
 
JJC EN-5 Eyecup Assembly allows for more comfortable viewing through the camera's viewfinder, especially for eyeglass wearers. Less stray light enters the viewfinder and a less flared, clearer image with which to compose your shot is provided. The eyecup assembly is made of soft silicone. The ergonomic design will fit your eyes better. JJC EN-5 includes a eyepieces with optical glass and a eyecup which replaces Nikon DK-19. You can still use this eyecup even if you lose the original camera eyepiece. The EN-5 Eyecup Assembly installs easily.and is compatible with Nikon D5, D500, D810A, D810, Df, D4S, D800E, D4, D800, D2 Series, D3 Series, etc.
 
Product Highlights
Seals out stray light for improved viewfinder optics
Soft silicone material
Allows for eye comfort, especially for eyeglass users
Ergonomic design
Includes a eyepieces with optical glass and a eyecup
 
Compatible with Nikon D5, D500, D810A, D810, Df, D4S, D800E, D4, D800, D2 Series, D3 Series, etc.
 
Eyecup replaces Nikon DK-29, compatible with Nikon Z6, Z7:
 
The eyecup 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 eyecup adopts an ergonomic oval shape to fit your eyes better. Besides, the eyecup is 360° 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
 
Compatibility Replaces Nikon DK-29 Fits Nikon Z6, Z7