C4D and VRAY - matching of Vray camera

Maybe you get in a situation, where the output of C4D viewport dont match the render after adding "VrayPhysicalCamera" tag to scene camera. Especially by macro images it can be desperate.

The only solver I found out is to change "zoom factor" in Vray camera tag.

Unfortunately I dont know any universal pattern of zoom factor. Best way is to turn off all of complex objects, add some simple cube a try to match the zoom factor with render inside viewport, until it matches.