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04-04-2013, 09:25 PM   #1
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Pentax K100D compatibility with SDM focus

I have the Pentax K100D (not the super) and from what I'm reading it looks like it would not be compatible with the SDM lenses like the Sigma 18-250mm I was considering buying. Does this mean it turns into a manual focus lens on the K100D or does it just not take advantage of the SDM focus and use the camera body focus?

04-04-2013, 09:32 PM   #2
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Crap, I just read some more about it in the lens specs and it appears it will turn into a manual focus lens on the K100D. So now I have to see if there's another decent zoom lens or do I need to buy a new body? Any thoughts? Of course - easy decision if money is not an issue...or my wife is not an issue...
04-04-2013, 09:48 PM   #3
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You could look for a used copy of the Pentax DA18-250 or Tamron 18-250 (they are the same). Not produced any longer, but a well-regarded superzoom that uses regular screw drive. Or upgrade your K100D to a newer SDM-capable body, such as the K100D Super, or K10D, etc. These older models are fairly inexpensive these days.
04-04-2013, 11:12 PM   #4
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Sigma even has some older screw driven superzooms that work fairly well.

K10D goes for around ~$175USD nowadays though, often with accessories.

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