I just bought a Rodenstock APO Ronar-CL 300mm and was told by the seller that it has plenty of coverage with movements for 8x10. I'm starting to have my doubts since I came across some info on a site stating the lens has only 40 degrees of coverage. I haven't recieved the lens yet, so I can't test it. The serial number is 10,591,012 and it's in a barrel. Does anyone have experience with this lens or have specs?