pgre Posted January 25, 2013 Share Posted January 25, 2013 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. http://www.the-digital-picture.com/Reviews/Canon-EF-24-105mm-f-4-L-IS-USM-Lens-Review.aspx Link to comment Share on other sites More sharing options...
nigelbb Posted January 25, 2013 Share Posted January 25, 2013 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. Link to comment Share on other sites More sharing options...
Ian Anderson Posted February 1, 2013 Author Share Posted February 1, 2013 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? Link to comment Share on other sites More sharing options...
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