For some reason there appears to be rare situations that I have been aware of where participants here have indicated that their 450M lenses are exhibiting less than optimal coverage - specifically falling short of 8x20. This is rather rare so I am at a loss to explain this.
Originally Posted by Rick Olson
I have two of these lenses and they both cover on 8x20 and 11x14 with the regularly reported excessive coverage.
It is a always good idea with any ULF lens purchase to reserve sufficient time with the seller to put it on a lens board and check the coverage for your self.