Quote Originally Posted by Alan Klein View Post
Why would they make both lenses with angle of coverage the same at 105 degrees?
In large format there are several image formats available, from 6x9cm up to 8x10" and the many larger ULF formats. The convention has been for the lens manufacturers just to make a few classes of lenses, each class with a defined field angle, in various focal lengths, and let the user decide how to use them. For instance a 65 can be used on 6x9cm as a standard wide angle with lots of movement available, for focus and perspective control , or it can be used as a super-wide on 4x5". If you want a standard wide with loads of movement for 4x5", then you go up to the 90mm equivalent. The extra image coverage and wide angle rays just get absorbed by the bellows etc on the smaller camera format.