Okay I know nothing about cameras so I have what's probably a totally idiotic question but I have a GoPro clone that has an on the fly zoom (by which I mean I press a button it zooms in, I press a button it zooms out). I'm curious as to what would happen if I put a manual focus telescopic lens in front of the normal lens. I know the normal problem with using other lens on sports cameras is the inability to focus the lens. Would I be able to use the focus on the lens manually and then fine tune the image on the screen using the zoom function. As I said I know nothing about cameras so just curious.