I am new to photography, and I bought canon eos 50d for a real estate photography company I am starting. I have a few questions. 1. Is there a reputable store online that you can find equipment for a better deal? 2. What wide angle lens should I get with this camera to get really good un distorted interior shots? I was thinking the ef 14mm/2.8L The lady I talk to at glazers said this lens would act more like a 16 on this camera. I have no Idea what this means.