i agree with u on the zoom point.. it's actually just giving u a zoom-ed effect..
on the other hand, how it is that a aps user maintain the same fov as an aps-c user when they are at the same distance? unless they are using a different focal length at the same distance from the subject to achieve the same fov..
p.s. pardon my ignorance
U mean ff and aps-c right? well if they are using a zoom lens, then its no issue. if using prime lens, then the ff user just hv to walk closer then. think of it this way, its always easier to walk closer to ur subject, than to walk further away, especially in doors.
Anyway as I mentioned earlier, with 24mp ff sensor, if I crop off the picture by 33%, I would hv an aps-c fov with around the file size of a 16mp roughly, which is still slightly more than all aps-c dslr except 550D.
Or just switch to aps-c mode on ff dslrs (Canon ff dslr can't do this though, disadvantage for them).