Perspective full format vs smaller formats

Unfortunately I can not even try wedding photography contract this out, but how is that have an ASP-C camera with eg. 50mm lens and one on a 35mm camera of miz equivalent focal length. Now reads and hears, crop factor ~ 1.5 which then the 50mm on an APS-C should be a 75mm lens. Does it also or just the picture is similarly circumcised but the perspective effect which remains one 50 mm? Top with the switch from small to medium format?

The "perspective effect" a lens (indirectly) stems from its angle. Or more precisely: from the influence that has this angle in practice on the shooting location. You stop on the same point, the image is clipped only by using a Cropformates, you go further for the same object size, change the perspective. A difference between 75 mm Follvormat and 50mm crop in "Perspective effect" does not exist.

1.die the will perspective through the distance from object to recording level determined.
2.der cut out is determined by the focal length (to the recording format)

My advice: Let it. The topic is so incredibly complicated that purely theoretical considerations will bring you hard to beneficial knowledge. On the contrary, potentially misleading.

Nobody could differ by fc resolution photos if a photo with a 5 d at 80mm or a 40 d with a G9 at 18mm or 50mm was made.