The DK-3 allows for more comfortable viewing with less stray light entering the viewfinder.
When coupled with Nikon DK-22 Eyepiece Adaptor and Nikon Finder Eyepiece (for FM, FE & FA Series Cameras), it allows mounting to Nikon D50, D70, D70S, D100, D200, F80, F65, F55, Fujifilm S1 PRO, S2 PRO, S3 PRO...etc. cameras.
To order a complete set for Nikon DSLR, visit:
http://shashinki.com/shop/product_info.php?products_id=182
Made in Japan!
Reviews Nikon DK-3 Rubber Eyecup for FM2, FE2 & FA Cameras