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.
Let me clear up any misunderstanding. I am not suggesting or implying or saying anyone is intentionally misleading anyone. I value each and every response. I am just trying to gain an complete understanding of how to determine the coverage of a lens.
That's all I was asking and several people have offered their knowledge, and I am greatful.

Thanks again for all the responses, and I will drop the subject.