Originally posted by gmmmmm I have a Tamron 28-200 zoom lens mounted to my old Pentax ZX-5n film SLR. Is there a digital Pentax SLR body you would recommend that will accept this lens without compromising functionality?
Welcome to the forum. I am familiar with the Pentax version of that autofocus lens, as well as the ZX-5n. As Adam says, it will work fine on a Pentax DSLR, and with the same field-of-view (FOV) as your ZX-5n only by using a Pentax K-1 or K-1 II, which are Full-Frame (FF) bodies having the same sensor size as a 35mm film frame.
Most DSLR bodies, however, use a smaller APS-C size sensor, which will produce a comparatively narrower FOV, effectively cropping the image and presenting a more telephoto effect. So with most DSLR models, this lens will effectively have no wide angle capability, unlike your ZX-5n. The images in the frame of an APS-C size DSLR using this lens would be of a size similar to a zoom lens of 43-300mm on your ZX-5n. In this sense, functionality of this lens would be compromised unless you put it on one of these two FF bodies.