I've read up quite a bit about m4/3rds but I'm still a little confused regarding focal length and crop factor... So.. my sources are telling me that m4/3rds have a crop factor of about 2 relative to 35mm sensors. That leads to focal lengths being doubled??? What does that mean? So.. if I'm using a 14mm lens, its an equivalent of using a 28mm lens on a 35mm?? I'm all interested in this because I'm really looking for a wide-angle lens to use with my E-P1. If I want a 20mm lens.. should I be looking for a 10mm lens then?? Also... does the use of adapters further increase the focal lengths???? For example, if I use an adapter to use a 28mm Nikon lens.. would it be 56mm? or even larger? Thank you in advance. I want to know exactly what I'm getting when I buy my next lens/adapter. *EDIT* Forgot to ask my main question... Does this narrow the FOV????