new Sigma 120-300 f/2.8 again? But now with weather sealing for sports?

Started Jan 7, 2013 | Discussions thread
jckk Regular Member • Posts: 158
Re: USB dock

I think this is the most notable feature being introduced for this lens.  Hopefully it should allow for focus adjustments beyond simple MA, such as if the lens has different focus accuracy at tele vs. wide, or is different based on subject distance.  I'm also hoping that it'll let the firmware adjust the focus algorithms so that Sigma lenses don't need to be rechipped at a future date when Canon tweaks their AF protocol.

James

dotweb wrote:

There are other changes to the new version:

"A newly developed USB dock, which will be sold separately and exclusively for new product lines, can be paired with new Sigma Optimization Pro software to update the lens firmware and adjust parameters, such as micro focus adjustment"

Br

Steen

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