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Ian Anderson

Parfocal lenses

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Nether of these articles claim that the 24-105mm is parfocal although they have comments in reply that contradict that

http://www.lensrentals.com/blog/2011/02/photo-lenses-for-video/4

http://dougchinnery.blogspot.co.uk/2010/01/canon-parfocal-lenses.html

 

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.

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Just happened across this thread which does a shootout with a bunch of zoom lenses to test their ability to retain focus:

http://www.dvxuser.com/V6/showthread.php?268682-Sony-NEX-FS100-parfocal-lens-shootout

 

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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