Well, that is an interesting point. Since I am not well versed on process lenses I can not speak to the definition that you propose. I do have a 600 mm Apo Nikkor process lens. This came from a graphics application and is barrel mounted without shutter. This lens on my 8X10 camera requires a bellows extension of approximately 24 inches when focused at infinity. I will say though that this lens will project a very large image circle. It will certainly cover a 16X20 negative and possibly larger when stopped down. However it would not cover that large a projection for a graphics application since the requirements for resolution would be much higher in my understanding.