Yes the 24-105 is supposed to be parfocal.
And my quick testing just now seems to back this up... It's strange though as others have reported it isn't so milage may vary.
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Posted 25 January 2013 - 12:25 PM
Nether of these articles claim that the 24-105mm is parfocal although they have comments in reply that contradict that
Stills photographers don't really care whether a lens is parfocal or not as they always use AF so I suspect that being parfocal is not a design goal for Canon's still photo zooms & if you have a model that is you should just be grateful.
Posted 01 February 2013 - 01:36 PM
Just happened across this thread which does a shootout with a bunch of zoom lenses to test their ability to retain focus:
The Canon 24-105 does pretty well, but the Sony kit lens 18-200 seems to come out best (although it isn't constant aperture...).
It's not easy this lark is it?
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