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02-12-2011, 05:26 AM   #31
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QuoteOriginally posted by Ubuntu_user Quote
All of Sigma's lenses that have "SDM" have it in the pentax mount versions...
No, not all, only the more recent ones. The Sigma 30/1.4, the 10-20/4-5.6 and the 100-300/4 are a few that come to mind that have HSM in Canon, Nikon and Sigma mounts, but are screw driven in Pentax mount.

HSM (Hyper Sonic Motor) is Sigma's version of "SDM"
SWM (Silent Wave Motor) is Nikon's version
USM (Ultrasonic Motor) is Canon's version

QuoteOriginally posted by VaughnA Quote
I don't think the 50 1.4 does. And I think that the 10-20 F4-5.6 is also HSM for Nikon..
The Sigma 50mm F1.4 in Pentax mount definitely has HSM; I've got one. The 10-20/4-5.6 doesn't, but the newer 10-20/3.5 does have HSM in Pentax mount.


Last edited by pop4; 02-12-2011 at 05:34 AM.
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