John E wrote in post #2101282
Why does canon go and make the EF-S 17-55 IS f/2.8, when they could have made an EF mount and all people would be happy (and they could have made it an "L" to boot.).
If they did, you would have a $1600 street price lens weighing 2 lb, rather than the $1100 street price lens weighing 1.5 lb. Not sure I would want to carry a 17-55 2 lb. lens as a walkaround, any more than I would want the 24-70mm f/2.8L 2 lb. lens as my walkaround on a 5D! (Different situation being paid to carry 2 lb of lens vs. trying to be a tourist with 2 lb of lens!) But your point is made, that it could have been the faster IS successor to the 17-40L.
John E wrote in post #2101282
It seems that the 24-105 L IS f/4 would be the perfect lens if it were an f/2.8. Next lens? Canon, how about a EF 24-105 L IS f/2.8? PERFECT!!!! Or an EF 17-55 L IS f/2.8? Another PERFECT lens.
Not sure I would want to carry a 24-105mm f/2.8L 2.5 lb. lens as my walkaround on a 5D (which I don't own)! I would prefer a 17-85 f/2.8 IS 2 lb. lens as a walkaround on the 20D/30D.