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- Duncan
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Can the 5DII perform different micro adjustment at different focal lengths?
My 24-105 nails focus in the 24-70 range, but progressively back-focusses from that point on with the worst result at 105.
The story is that I grabbed a few shots to check out my replacement 5DII, and in one of the test shots I noticed it had back focussed badly.
Since then I've been out and done a bunch of tests using a biscuit tin on edge as focus target about 20ft away on tarmac.
I used both a 5DII and 60D, results were identical from both bodies, but 60D won't micro focus so I'm only asking about the 5DII.
As well as the 24-105 I also tested a 70-200 f4 IS L; focus was spot on at all focal lengths. It is only the 24-105 at long focal lengths that has a problem.
A few years ago this 24-105 was calibrated by Elstree.
It was a soft copy but I never really noticed until I went full frame which made the problem far more noticeable. I've been very happy with it since then, but have noticed that 105mm has never been as sharp as other focal length; but slrgear tests show this too, so I never looked further.
Obviously I need to test some other 24-105s to see if they all do it, but assuming it is just my lens then perhaps it needs a return visit to Elsetree?
My 24-105 nails focus in the 24-70 range, but progressively back-focusses from that point on with the worst result at 105.
The story is that I grabbed a few shots to check out my replacement 5DII, and in one of the test shots I noticed it had back focussed badly.
Since then I've been out and done a bunch of tests using a biscuit tin on edge as focus target about 20ft away on tarmac.
I used both a 5DII and 60D, results were identical from both bodies, but 60D won't micro focus so I'm only asking about the 5DII.
As well as the 24-105 I also tested a 70-200 f4 IS L; focus was spot on at all focal lengths. It is only the 24-105 at long focal lengths that has a problem.
A few years ago this 24-105 was calibrated by Elstree.
It was a soft copy but I never really noticed until I went full frame which made the problem far more noticeable. I've been very happy with it since then, but have noticed that 105mm has never been as sharp as other focal length; but slrgear tests show this too, so I never looked further.
Obviously I need to test some other 24-105s to see if they all do it, but assuming it is just my lens then perhaps it needs a return visit to Elsetree?
