[Leica] not entirely OT: the recurrent dilemma

[rbaron at concentric.net (Robert D. Baron)]

Phillipe, there are two other things to consider when selecting your 
Canon lenses:

First, the faster the lens, the better the autofocus works in dim light. 
  This is written up in several Canon technical papers, among other 
places.  That is one reason I have stuck to 2.8 or faster lenses.

Second, the minimum focusing distance may be important in some settings. 
  For the 70-200 it is 4.6 feet (!); for the 85mm 1.2 it is 3.2 feet; 
for the 24-70 it is 1.25 feet.

--Bob