Sigma primes w/ K-7 or K-5

GregX999 · 11-14-2010, 08:48 PM

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

Adam · 11-14-2010, 10:03 PM

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!

**montman** · 11-14-2010, 10:11 PM

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.

GregX999 · 11-15-2010, 07:02 AM

Originally posted by montman

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???)

pop4 · 11-15-2010, 07:25 AM

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

).

11-14-2010, 08:48 PM	#1
GregX999 Forum Member Join Date: Jan 2010 Location: South SF Bay, CA Posts: 71	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
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	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! Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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11-14-2010, 10:11 PM	#3
montman Site Supporter Join Date: Dec 2009 Location: Kansas City Photos: Gallery Posts: 576	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
GregX999 Forum Member Join Date: Jan 2010 Location: South SF Bay, CA Posts: 71 Original Poster	Originally posted by montman 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
pop4 Veteran Member Join Date: Aug 2007 Location: YMML Photos: Gallery Posts: 1,879	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 ).