The Konus #5637 SLR Photo Adapter is for their Biorex series microscopes.
This device converts the optical path to a standard T-mount fitting, but also comes with a wide field eyepiece. With the Biorex, you shoot with your SLR through the dedicated eyepiece.
To use with your SLR camera, you must add a Konus T2 adapter ring or another manufacturer's T-mount specific to your camera brand.