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+--- Thread: next PZ lens test report: Canon EF 24-70mm f/4 USM L IS (on APS-C) (/showthread.php?tid=1915)
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next PZ lens test report: Canon EF 24-70mm f/4 USM L IS (on APS-C) - Klaus - 05-02-2013
Still a great performer ... with a bug:
http://www.opticallimits.com/canon-eos/832-canon_2470_4apsc
next PZ lens test report: Canon EF 24-70mm f/4 USM L IS (on APS-C) - Guest - 05-02-2013
So is a bug better or worse than a design flaw ?
next PZ lens test report: Canon EF 24-70mm f/4 USM L IS (on APS-C) - Klaus - 05-02-2013
your choice
next PZ lens test report: Canon EF 24-70mm f/4 USM L IS (on APS-C) - HarryLally - 05-02-2013
I really can't see how Canon can release this lens onto the market. It's got such a serious design flaw that it's not fit for purpose. It should be the ideal lens for me to go with the 70-200 f4L Is but as it is I will stick with the slightly heavier but less sharp 24-105 f4L.
next PZ lens test report: Canon EF 24-70mm f/4 USM L IS (on APS-C) - Brightcolours - 05-02-2013
Quote:I really can't see how Canon can release this lens onto the market. It's got such a serious design flaw that it's not fit for purpose. It should be the ideal lens for me to go with the 70-200 f4L Is but as it is I will stick with the slightly heavier but less sharp 24-105 f4L.There are many who use this lens without reported problem... From what I have seen, they use a 6D. It might be that with AF it is camera body dependent, this focus shift. I have no way of checking that, but it might be worth checking it out.
next PZ lens test report: Canon EF 24-70mm f/4 USM L IS (on APS-C) - HarryLally - 05-02-2013
Thanks BC.
I have the 5DII, same as Klaus. I'll check the lens out with 6D users over at DPR. Also, I think DPR will be testing the lens soon on a 6D, which seems to be their current Canon FF body used for testing. No doubt they'll have read Klaus' review and will look into the 'problem'. They have also commented in the recent 24-70 f2.8L II review that the AF was fast and very accurate with the 6D and a bit hit-and-miss with the 650D. So maybe the AF accuracy is body dependent. I'd be very surprised if RSAs were body dependent though.
next PZ lens test report: Canon EF 24-70mm f/4 USM L IS (on APS-C) - Klaus - 05-02-2013
Just to mention once more - the RSA test was done with deactivated AF.
The AF is fine at max. aperture.
next PZ lens test report: Canon EF 24-70mm f/4 USM L IS (on APS-C) - HarryLally - 05-03-2013
Are you saying that if one uses AF, then the focus shift will not be a problem? i.e. that the camera will correct it in some way?
next PZ lens test report: Canon EF 24-70mm f/4 USM L IS (on APS-C) - Klaus - 05-03-2013
Quote:Are you saying that if one uses AF, then the focus shift will not be a problem? i.e. that the camera will correct it in some way?
No, I said "at max. aperture". :-)
Theoretically it could apply a correction factor (Pentax does so I remember) but this does not seem to be the case with the test cameras. Possibly newer EOS cameras can do it.
And to be somewhat more precise - you will probably never experience the effect when shooting at f/11 because the DOF catches up with the RSAs.
The really critical setting is f/4 or f/5.6 at close focus distances.
next PZ lens test report: Canon EF 24-70mm f/4 USM L IS (on APS-C) - JohnMc - 05-10-2013
Crystal ball stuff-
Do you think RSA issue likely in all copies, at least to some build date?
Is Canon likely to correct issue, or is it destine to be forever 'feature'?
(EOS newbie with no EOS glass between 22 and 70mm.)