Originally posted by Sykil The rest doesn't really have anything to do with my point, which is that if you have a 50mm wide angle lens with the same physical diaphragm as a 50mm normal lens, the 50mm wide angle will have a higher maximum f-stop (e.g. smaller maximum entrance pupil) due to the necessary differences in the way they're designed and the effect that has on the entrance pupil.
I am wondering if your terminology is used any place else. It is a paradigm shift I am not familiar with. I have never heard a 50mm designed to have an image circle that will cover a medium format as a "wide 50mm" before. I can see the terms utility in lens design, is it used elsewhere?