Perspective distortion always seems to be a topic that gets keenly discussed around here, so here's a classic example with 3 shots I took when I was quite new to my superzoom camera.
I was standing on the platform and the locomotive was coming towards me quite slowly, so not knowing which might give the best picture, I took three pictures, maintaining the same subject size by shortening focal length (zooming out), thus counteracting the reducing camera to subject distance.
This was a BIG mistake; upon review, when flicking through them in succession, I never could decide which one looked 'right'. Note in particular, the apparent length of the boiler.
At 185mm (equivalent);
At 117mm (equivalent);
At 79mm (equivalent);
Also note that these are all in the "telephoto" area and nowhere near the full zoom range I have! If you look at the distance the loco travelled, it really isn't that far.
So, let that be a warning to you; think ahead and compose the shot in your mind so you get one good result, rather than 'machine gun' the subject.
Anyone got any thoughts?