I notice that alot of people put ridiculous titles for their threads and it seems to catch people's attention. Hence my thread title.
So I'm wondering if there exists some sort of website or program that you can enter in a given focal length and maximum aperture, even ones that seem ridiculous like 10-400mm with f/1.2, and have the program calculate the approximate size of such a lens. I'm trying to get a more concrete idea of why lens makers don't make lenses with outrageous capabilities like this, if they're even physically possible.
Any ideas? Thanks