Easily mount your camera to a telescope or microscope with the 25-166-2227 T-Mount Lens Adapter! This adapter features a 42 mm thread diameter with a 0.75 mm pitch screw and a 55 mm flange focal distance. Plus, it's designed to work with a Pentax K 35mm SLR Film Camera! Simply mount the T-Adapter to the camera lens mount and you're ready to take pictures! Order your 25-166-2227 T-Mount Lens Adapter today!