Many thanks for the quick answers

Yes, the lens can be used on the D7200. However, it should be noted that the focal length is increased by a factor of 1.5. This is the same for all DX sensors from NIkon. This results in an actual focal length of 36-105 mm (KB equivalent). So if a real wide angle is needed, I would advise against this lens, even though it is optically excellent. A 16-85 (KB 24-127) or a 12-24 (KB 18-36) would be recommended. Unless a full-frame SLR is also used, I would generally prefer a lens designed for the DX format. They are smaller, lighter and usually cheaper.

You can use any full-frame lens on an APS-C format camera. I can definitely recommend the Tamron.