I will be shooting at church, at night, under fluorescent lights. I will shooting my daughter who is in the choir, her first time. I will be shooting Kodak 400Tmax, using an EOS 3. My question is lens choice, I'm having a hard time choosing between the EF100/2 or EF 24-105/4 IS. At first I was thinking of using the 24-105 and push the film to 1600, relying on the IS for a lower shutter speed. But I do have the 100/2, and would I really gain anything by using it.