First things first, I'm talking ONLY about framing here. No light sensitivity, no bokeh quality, no pixel quantity, etc.
A 50mm in a FF camera will give a certain composition and framing. How can I achieve the same composition and framing with a APS-C camera without changing the lens?
Will moving away from the subject will give me the same image? I know that zooming isn't the same thing as moving closer or farther from the subject, but will I be able to achieve at least a similar shot?
This video triggered this question. Check it out, it's very illustrating.
EDIT: I know that a 35mm would give me the same shot in a APS-C. I want to know if this is possible without changing the lens.