Excellent purchase.... I would have to agree with Hal, I have both the 1D and the 1D MkiiN and I still really like my 1D and don't be fooled by the resolution, this is a fine camera. I also have the 100mm f2, that is a great value lens, very shallow depth of field, but an excellent lens and with the superb focus of the 1D, you will be okay. I think it is good up to 800 ISO in good light, after that, you will need to do some work. 40D for a 1D.... never, the 1D is fine instrument meant for serious work. The 40D is not in the same league when it comes to build, focus system and viewfinder. 4 MP is still okay, I recently had a magazine cover with it.... still fine for quality images. I will be using my 1D this weekend shooting an indoor bull riding event, the synch speed of 1/500 allows me to use remote manual flash .... can't do that with many cameras anymore, certainly not the 40D.