A 50mm prime lens, whether APS-C or Full-frame is designed around the 35mm format. As such, is the angle of view actually different on a DX/APS-C crop sensor or are we just seeing less of the full frame angle of view?
I think that the angle of view, depth of field, and compression are the same as on an FX/Full frame but we are seeing only middle, correct?
If so, then isn't it the case that a 50 1.4 is giving the same DOF on full-frame as DX but because we are seeing less, we have to stand further away, thus the "increase in DOF" on a DX?
More importantly, and the thrust of my question, is that the perspective/compression is the same regardless of crop factor on 35mm format lenses, right?