I'm wondering if sticking a wide-angle or telephoto adapter lens designed for a digital camera would work on my 35mm cameras. I don't have it right here in front of me, but I have a canon powershot g5 that i bought the extension tube and a cheap 0.5x wide-angle adapter for. I think the thread size on the back of the adapter lens is like 52mm. If I used step down rings would I be able to use this wide angle adapter lens on my minolta x-700 with 28mm (49mm thread) lens? I know if it works the quality wouldn't be great, but it'd be like having a 14mm fish-eye lens and all I'd need is a step down ring. Is my reasoning flawed? Anyone ever try doing something like this? Thanks for any thoughts!