Yep, I have a Sigma lens with a problematic chip, it can't focus
correctly beyond f5, before f5 focus is perfect.


On 9 November 2012 21:53, Krisjanis Linkevics
<krisjanis.linkev...@exigenservices.com> wrote:
>> > USB port that according to promo on dpreview.com will allow not just
>> > changing lens firmware but also things such as micro focus
>> adjustment.
>
> What's the point of focus adjustment on the lens anyway? Unless it is for 
> fine-tuning the distance scale on the lens itself, I would think it doesn't 
> do anything. Focus is determined by the camera body, not the lens. Am I 
> missing something here?
>
> kris
>
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