I have both the 17-50 and 24-105 and 50D in question. The 17-50 does work with the 50D. The 17-50 is better at wide angle and low light situations, the 24-105 is better at everything less ( color, constant, sharper, better built, IS, close focusing, correct auto-focus ) . The 24-105 is heavier and 24mm on a crop sensor camera is not wide angle, if you like that stuff, but it is wide anough for small group shots, and the 105 is very handy for tight face and shoulder shots.


As usual I like DB suggested lens combo, 17-55, 50, and 70-200 f4 is


Although I have the 100-400 zoom instead of 70-200, which is better for wildlife, and race cars for me, ( see two other recent threads of telephoto Zooms ).