Quote Originally Posted by mrwizard45 View Post
What are the main differences between the 28-105 and the 28-135? Besides focal length and size?
The 28-105 focuses a tiny bit faster, is 1/2 stop faster at 105mm, and uses 58mm filters. The 28-135 has Image Stabilization if you like to shoot handheld at marginal shutter speeds and uses 67mm filters.