I am a birder and currently have the 40D...which is a great bird camera. It is though only 10mp and that works fine.
The 7D is 18mp.....my question is...since I will ''crop" pictures as I shoot from distances and birds are small, will the extra 8mp that a 7D provides over the 40D essentially equate to having a 1.4 TC? If I crop, the 18mp will allow me to crop and still have better quality, more so than cropping the same image on a 40D? jim