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05-05-2008, 11:56 PM   #1
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SDM and K100D

Hi!

I know, that Sigma's HSM autofocus does not work on K100D body. But what about Pentax's SDM? Will the autofocus work on my K100D (not Super).

Thanx!

05-06-2008, 12:05 AM   #2
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Nope. You'd need the K100D Super to have the extra power contacts in the KAF2 mount that are used to drive the SDM. With your K100D, the AF drive is by the in-camera motor through the drive screw coupler in the KAF mount.
05-06-2008, 12:33 AM   #3
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Thanks for that.
Does anybody know, will Pentax produce also a no-SDM versions of new lenses?
I will probably upgrade to K20D in future, but still... Am I limited to old lenses till then?
05-06-2008, 12:39 AM   #4
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If you really want the lens, and plan on upgrading to a newer or better model just buy the lens.
You can still manually focus them

Besides I believe that all the lenses to date still have the Body Driven AF system built in.
It's sounding like the DA 17-70/F4 will be the first Pentax lens without it.

05-08-2008, 08:16 AM   #5
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QuoteOriginally posted by christinelandon Quote
Nope. You'd need the K100D Super to have the extra power contacts in the KAF2 mount that are used to drive the SDM. With your K100D, the AF drive is by the in-camera motor through the drive screw coupler in the KAF mount.
You are wrong.
Current Pentax SDM lenses (DA* 16-50/2.8 and DA* 50-135/2.8) WILL work with K100D, K110D and *ist series.
They have ability to use in-body screw drive.

BUT the new 17-70/4.0 seems to be SDM only. So AF will work only with K100D Super, K10D, K20D and K200D.
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