So you are saying an EF 30mm lens will be the same as an EF-S 30mm lens?
The focal length will remain the same.
The image circle created at the image plane will be definitely small and as a result a smaller sized "field of view" will be captured at the image plane.
And as Canon builds them, the EF-S one cannot be mounted on an FF body (unlike some third party manufactureres).
Are you saying these are wrong? On top of that I need to clarify whether the perspective of a lens is a function of focal length or field of view?
Please don't read more into my post than I posted. It was a simple question and not a trick question at that. Which part of my question made you infer that I was saying you were incorrect? I believe all the guy wants is an EF-S lens with a FOV-equivalent of 50mm but with a smaller sized field of view capture at the image plane. That seems like a simple request. Why read so much more into it? Will the two images taken result in the exact same view, one with an EF 30mm vs. EF-S 30mm lens? I don't really know.