« on: September 15, 2012, 01:59:51 AM »
At 1.2 the depth of field on the 50mm L at close distances is about 4 millimeters. If you or the subject moves the slightest bit, it will not be in focus where you intended.
I usually compensate by shooting at F2 or 2.8 and find it very sharp at those f stops.
Ai Servo on the 1d x takes care of that.
Will the 5d miii do the same in Ai servo?
For a portrait with small movement I say they're very similar yes. If you work with the 85 L the difference in response is much better on the 1d x. But with the 1d will also track the eyeball of å running 3 year old at f1.2.