Hi Paul,

I am going to answer this question two different ways. At the basest level, 35mm lenses were all designed to go on a 35mm sensor. In my opinion, the full frame format is best met in this fashion as while there may be compromises, the system is just designed this way.

Having said that, it is not necessarily a perfect device and crop frame cameras have certain advantages. You specifically mentioned wanting to shoot wildlife and getting the most of a telephoto lens. Well, that is definitely the crop frame camera's reputation to fame...that the smaller sensor yields an alleged field of view difference that yields sharper photos that appear to have been taken with a longer focal length lens. This is achieved by using only the center of the lens. This may provide great adantages...allowing you to use smaller lenses to achieve the same result at the telephoto end.

James