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08-02-2007, 12:27 PM   #1
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Sigma HSM compability with Pentax SDM

I have been wondering if Sigma 30mm F1.4 EX DC HSM for Pentax lens - which should have a hypersonic AF motor (HSM) - would be compatible with Pentax (k10d) Supersonic Drive Motor (SDM) feature. In general, how is it with hypersonig technology, should Pentax's version be applicable also with third party lenses?

thanks, Gawan


Last edited by gawan; 08-02-2007 at 12:28 PM. Reason: Signature added
08-02-2007, 12:50 PM   #2
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I haven't heard anything about SDM support from Sigma as of yet. (I maybe wrong).

Sigma currently does not have access to Pentax SDM lenses so they don't really know how the system works. Sigma builds lenses for specific mounts viz reverse engineering of OEM equipement.
08-02-2007, 02:50 PM   #3
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So, each implementation must be specific to brand. No generic HSM.

Seems you are right - I guess my online net store simply mixed specs for different mounts, as I checked in Sigma's own site an could not find a HSM for Pentax mounts, only otherwise the same lens (but no HSM in the name).

Thanks
08-02-2007, 03:14 PM   #4
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Yea while Sigma brands their supersonic AF technology as "HSM", the activation sites are lens mount specific. Like as in how they communicate with the camera body. Nikkor AF-S code is different from Canon's USM etc.

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