Originally posted by buliwyf strictly speaking, yes. BUT I was talking about achieving the same FOV with different lenses.
If you want to achieve the same FOV of a Full Frame on an APS-C, you either have to move back/forward, or change lens focal lengths. Either way, you alter the perspective.
False. If you stand in the same spot and shoot 33mm on APS-C and 50mm on FF, you get *exactly* the same perspective. The notion that perspective has anything whatsoever to do with focal length is a myth that apparently will take a long time to die, but it is a myth nonetheless. Perspective is a function of position and position only. Changing FOV might cause you to want to change position, which is how the myth started ("oooh, this wide angle lens made me come in closer to my subject, and now it's distorted - must be the lens that it did it!" - no, it was the fact that you changed position to accomodate the change in FOV). But as long as you maintain the same position, you have the same perspective. So as long as you achieve the same FOV with two different lens/camera combos, they will have *exactly* the same perspective. Physics does not allow otherwise, I'm afraid, unless you install a black hole somewhere between you and your subject to bend the light. But here on earth, light travels in straight lines between your subject and your lens.
BTW, I could close this thread as Falk suggests, but might as well let this play out - I'd hate to be accused of closing it just to have the last word. And even then, I'm not sure closing it is warranted.
Oh, and Jewelltrail: "These go to eleven"!