And you can't do that manually ? ^^
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Sure you can do it manually, but AF can be a great help, and why would you not want AF if it works great?
I for one am glad Canon is updating the 24L. I have this lens (mark I), and it is nothing to brag about, and it ain't no 35L...now the 35L is freakin awesome...razor sharp wide open and everything the mediocre 50L & 24L should've been.
Canon's cr@p---> 24L Mark I, 50L Mark II. Two lenses that are just so-so, even after calibration.
Those two lenses are not in the same IQ category as these awesome pieces of glass:
35L
85L
135L
200L
all the tele-L primes.....