Oren - I have been using mostly the EF-S 17-55 and EF-S 15-85 on the APS-C bodies when I need general purpose focal length ranges. Neither has the build quality or full frame compatibility of the 24-70 and 24-105 L lenses, but both have the image quality I'm looking for (at least as good) along with an often-better-for-APS-C focal length range.


I would love to see the 24-70 f/2.8 L offered with IS - that is an obviousfeature advantage held by the the 17-55. Being full frame lenses, the L's will show less vignetting at wide open apertures than the EF-S lenses when mounted on APS-C bodies.