So as far as I am aware, lens design for DSLRs are just updated designs from the film cameras, with a few changes for lenses like the EF-S which won't work with a FF. But what I am not understanding is why we are dealing with say an 18mm lens that gives us a crop/zoom whatever you want to call it that is 1.5x or 1.6x. How come a lens like Canons EF-S, which only works with their crop bodies, isn't designed so that an 18mm lens gives a view like that of an 18mm on a FF? Is it just so people don't get confused?..isn't the mm distance on components inside the lens itself? I mean, you see people who used fisheye lenses on 35mm and on FF cameras, and they sell the same lens for use on a crop, and people use them. But if you are loosing so much of the image that makes it what it is, and crop frames are not a complete minority of the market by any stretch....you would think they would make lenses for them. I guess I am asking because I read that since we are squeezing all these pixels on a sensor that isn't getting bigger, we are getting the extra information out of the same area of the lens....which in general means you need higher quality glass to really realize this, but the professional glass is designed around FF cameras, so APS-C users are by and large using mediocre glass and then pulling more and more information out of only that cropped portion of it. Does it makes sense at what I am getting at?