Quote Originally Posted by Donsta
I did a quick test with the 240mm Graphic Kowa I have yesterday - Sandy's 520mm image circle seems spot on at f64. Interesting that the test shot I did shows the lens to be tack sharp right up to the edge of the image circle - the lens really is a screaming bargain if you can find one.
Just make sure that the lens fits into a shutter, if that's what you want to do. Some do, some don't. At F64, I doubt a shutter is really needed, though. Do ULF shooters tend to use lenses in shutters?