I recently dropped my camera, and smashed the lens hood off one of my Rokkors. I guess I should be grateful it was on there, and the lens didn’t cop it. I am looking to replace it, but it struck me as being too small anyway. With the crop factor sensor, should I be getting a hood designed for a longer focal length lens? For example a hood designed for a 35mm, to use on a 24mm? Or is that dumb?