I've read about the cheap cctv lenses, but they seem to have a pretty small area for getting sharp pictures. Are there any others that I can look into? I'm new to this, but I'm looking for something to use in low light that is faster than the kit lens for quicker subjects. I'm gathering I would want something at least an F2. Not sure yet what focal length I would want, but I'm thinking 30-40mm is probably the longest. Not sure what most lenses can be had for, but around $50 (including an adapter would be even better) or less would be a nice start. Thanks!