Re: 24-105mm FOCUS SHIFT survey - submit serial numbers
I'm wondering what else is not quite right with the lenses in the 181 range... If they exhibit that great a difference, is there also other optical performance problems. I can't believe that some exhibit no focus shift and others exhibit what appears to be substantial focus shift without there being some other optical symptoms.
That is, unless this is really an electronics issue...
If there is a focus shift correction algorithm in the lens that is either not working correctly or is working but shouldn't be (as in, it has been designed to be used but this lens doesn't require it so it should be dormant, but it is going zombie), or possibly an interaction between the aperture encoder and the distance focus controller, the lens could be doing things a bit haywire on the electronic side.
I'm a bit worried that lenses in the 181 range that don't currently exhibit this problem could have it begin if it is tied to a slightly out of spec electronics part...
---Michael
Feb 05, 2018 at 12:33 PM
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