First post in a loooooong time! I've since picked up a new hobby, so you're going to be seeing a lot of posts about photography!
It's a well known fact that using a longer focal length lens, and then stepping backwards so you can still fit your subject in frame, will "compress" the perspective in your image (i.e. make background objects appear a lot closer to your foreground).
What I haven't been able to find out until today was the effect of using different focal lengths, but keeping the same shooting position and cropping the image down to the same field of view. Seems that this has no (or very little) effect on perspective.
Any slight differences in the image above are probably due to the effect of lens distortion (barrelling, pin cushioning), or me forgetting to focus on the same point for each frame.
Images above taken with a Canon EOS 7d (1.6x FOVCF), using a 28mm f/2.8, 50mm f/1.8 and the awesome 70-200mm f/4.0 USM. All shots taken at f/4.0
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