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07-24-2010, 08:07 PM   #1
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is SDM speed faster on newer bodies?

am impressed with the light gathering capability of the 50-135mm f/2.8 at a recent photo show.


was the only dynamic subject available at the time. Used my most common settings plus a bit more usually reserved for fast primes for a demo. Its an indoor event so getting a picture that bright even at f/2.8 without flash using prime settings is quite amazing.

What i want to ask, is SDM speed faster on newer bodies like the K7 or same as K10D?


Last edited by Reportage; 07-24-2010 at 08:13 PM.
07-25-2010, 08:46 AM   #2
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No idea. My guess would be NO. Pentax did not make a fast SDM (I have the DA*55mm and 50-135mm) but to my opnion it is very accurate. Sigma's HSM is much faster when I tried the 70-200mm on a K-7.
07-25-2010, 09:52 AM   #3
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Autofocus relies on hardware and firmware in the body, and is much faster all around for the K7. You should see a difference on almost all lenses, SDM or not.
07-25-2010, 11:55 AM   #4
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QuoteOriginally posted by mysticcowboy Quote
Autofocus relies on hardware and firmware in the body, and is much faster all around for the K7. You should see a difference on almost all lenses, SDM or not.
I know. But Sigma's HSM is much faster then Pentax's SDM. Both tested on K-7.

07-26-2010, 03:24 AM   #5
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QuoteOriginally posted by mysticcowboy Quote
Autofocus relies on hardware and firmware in the body, and is much faster all around for the K7. You should see a difference on almost all lenses, SDM or not.
Different body won't force SDM motor to rotate at higher speed.
07-26-2010, 03:48 AM   #6
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AF speed is dependent on both the response time of the Autofocus system in the body, and the SDM motors driving the lens.

The SDM motors work at the same speed , but the K-7's AF response is faster than older bodies, especially in lower light. So the overall AF response is faster on the K-7, that's been my experience anyway.

Last edited by kittykat46; 07-26-2010 at 03:55 AM.
07-26-2010, 05:36 AM   #7
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anybody tried out using and SDM lens on a Kx?
im imnterested in snagging a DA* 16-50mm oooohhh the G.A.S
07-26-2010, 10:57 PM   #8
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My 16-50 is faster on my brother's KX than on my K200d, but just a smidge.

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