I'm new to photography with good equipment. I've had a rebel XT for years and just upgraded to a 7D with a 15-85mm lens. In terms of image quality, people say that the 15-85mm is GREAT. I like pictures I'm getting with good light, but I think it's too slow for me.
Would it be worth it to sell the 15-85 to get a 24-70L? Or should I put the money into a nice flash?



