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11-14-2010, 08:48 PM   #1
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Sigma primes w/ K-7 or K-5

Just a quick question...

I have a K-7 (might upgrade to K-5 eventually). Will the Pentax version of the following Sigma lenses work on those bodies? Will the HSM AF will work?

- 28mm F1.8 EX DG ASP Macro
- 30mm F1.4 EX DC HSM
- 50mm EX DG HSM

The specs on the Sigma page, under Pentax, talk about things like "SF series cameras" and other things that I don't recognize.

Thanks,
Greg

11-14-2010, 10:03 PM   #2
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Yes, they'll all work, along with the SDM is available.

The SF series cameras were Pentax's first autofocus SLRs to use SAFOX- that just shows how incredibly backwards-compatible the K-mount is!

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11-14-2010, 10:11 PM   #3
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I have the Sigma 30 1.4, HSM is only for Canon and Nikon. Specs Here
30mm F1.4 EX DC HSM - Wide Angle Prime Lenses - SigmaPhoto.com
Check out the Corresponding mounts section for compatibility.

The Simga 50 1.4 page is more vague.
11-15-2010, 07:02 AM   #4
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QuoteOriginally posted by montman Quote
I have the Sigma 30 1.4, HSM is only for Canon and Nikon. Specs Here
30mm F1.4 EX DC HSM - Wide Angle Prime Lenses - SigmaPhoto.com
Check out the Corresponding mounts section for compatibility.

The Simga 50 1.4 page is more vague.
On that page, it says it's for Pentax J mount... I've never heard of a "J mount".

If the Pentax version isn't HSM, what is it? Does it just rely on the screw-drive? (Looks like none of the lenses I asked about list HSM on the Pentax version???)

11-15-2010, 07:25 AM   #5
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The Sigma 30mm F1.4 has screw driven AF in Pentax mount, while the Sigma 50mm F1.4 has HSM for Pentax mount (I know because I have one ).
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