What about the sigma 10-20 which is a cropped frame lens? It would be 15-30 on a full frame...
I am confused, Stamper. I always thought that a 10-22 cropped-sensor lens would only be
equivalent to 15-30 in full-frame terms, i.e., it could never
be 15-30 on a full frame. And I always thought that a 10-22 lens (or any other focal length, fixed or zoom, for that matter) would always be 10-22 on a 35mm full-frame, medium format, large format, or any other format under the sun. Except, when you put it there, its inherent smaller image circle would not be able to cover the whole, say, 35mm format. No?