I'll corroborate as well. I shoot 12x20 and have the 450M. It covers with no problem. As does the 355 G-claron (little movement). The Cooke 222mm Series VIIa will also cover if perfectly centered and hyperfocally focused. The spec sheets from the manufacturers are generally conservative. Since we generally contact print a 12x20 negative, our 'circle of confusion' requirements are less stringent than somebody shooting an 8x10 who perhaps might entertain enlarging the negative.

Quote Originally Posted by Donald Miller
The way that you can determine that a 450 Nikkor M will cover 12X20 is to take Jorge, Sandy King, myself, and any number of others word that it will cover. We have no reason to mislead anyone.