dlleno said:
The after market already has $1500 70-200 f/2.8 offerings. I don't see the motivation for Canon to compete in that arena.
One of the main issues a lot of people have with the current 70-200mm f/2.8 IS II is that it is too heavy to comfortably carry through the day, and it costs $2500.
By adding a EF-S F/2.8 70-200 or EF-S f/2.8 55-250 IS etc, Canon does a few things:
A) Further legitimizes EF-S/crop mount making 7D MKII and 70D easier sells.
B) Competes with third parties that are likely stealing sales away from them for people who simply cannot afford a lens that costs $2500.
C) Does little to impact sales of EF 70-200 f/2.8 IS II because EF-S does not work on a full frame camera, and the EF version would be metal and weather sealed unlike the EF-S version.
D) Provides a lighter weight plastic F/2.8 lens w/ metal mount - Canon appears to be positioning crop for wildlife photographers who may not want to go hiking with a 3.3lb lens. While it may not be massively lighter, I am sure they could cut down the weight and size a bit if more plastic was used and the lens was optimized for EF-S.
Canon can very easily convince people it is worth buying both a high quality EF-S telezoom and also the current EF 70-200. Don't forget many currently have both the F2.8 *and* F/4 70-200 simply because the former is too heavy for some applications. The EF-S would be another alternative that is cheaper and of lesser build but similar optical quality, better for crop than the f/4L.
This is of course all conjecture, but I think it would be a great idea to get people to buy into the idea of owning both APS and APS-C sets for different situations.