I wanna buy an all-in-one lens. I have read the reviews of both lens but if anyone have used both of them please help to have some comments and advice. Currently I got 50D with Tokina 12-24 f/4 DX, Canon 50mm f/1.4.
IQ wise, the 4x L zoom will be better than a 10x zoom. but the later has longer reach and flexibility for an all-in-one
if using by itself, the 24-105 might not be as wide on a crop sensor as the 18-200mm
for crop body, i personally would choose 18-200 for the wide angle & longer reach & consider 24-105 if eventually planning to move to full-frame... just that there'll be an inconvenience to switch to Tokina for wide angles. on the tele end, 105mm x 1.6 crop factor is more than what i need for most of my photos.