This is the Photomic (non-AI mount) and works only on older F, F2 and Nikkormats. It does not work on any digital without modification. What is "Nikkor-Q?". "Q" is for "Quat" and means four elements. The lens is works well but has fungus in a couple of spots inside the glass. This should not effect image quality. There is also a security number engraved subtly. This is a good lens at a great price.