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08-02-2010, 03:05 PM   #1
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Why is Sigma still treating Pentax differently?

Does anyone know why Sigma continue to make some of their Pentax-mount lenses without HSM, while the other mounts of the same lens have HSM?

Mostly I'm referring to the 30mm f/1.4, which costs the same in Pentax-mount, without HSM. As far as I know, Pentax has been compatible with HSM since firmware 1.03 on the K10D. I realise Pentax-mount must be a very small part of Sigmas business, and there has been some progress, for example the latest 10-20mm is HSM for Pentax.

I've asking Sigma why they're still producing non-HSM for Pentax - will let you know what they reply.

08-02-2010, 03:50 PM   #2
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they usually switch to SDM when they update a lens. If the lens has not been updated recently then it's not likely to be SDM. But the same is true with Sony and to some extend Oly.
08-02-2010, 04:33 PM   #3
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When these lenses were released, there were still a substantial number of Pentax bodies which did not support SDM/HSM in circulation. So it didn't make good business sense for Sigma to release them as HSM.
08-02-2010, 09:18 PM - 1 Like   #4
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I'm kind of bummed that Sigma is adding HSM and OS to all their lenses these days. Means they'll be unnecessary big, heavy, and expensive.


Last edited by Marc Sabatella; 08-03-2010 at 04:26 PM.
08-02-2010, 10:15 PM   #5
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QuoteOriginally posted by Marc Sabatella Quote
I"m kind of bummed that Sigma is adding HSM and OS to all their lenses these days. Means they'll be unnecessary big, heavy, and expensive.
Well they have 2 lenses, I believe a 18-50mm f/2.8-5.6 and a 50-200mm f/4-5.6 both with OS and HSM for Pentax, for around $200 and $160 in that order, so I don't necessarily think that means it adds cost to the lenses, but I'm sure it's a good excuse to with the higher end models
08-02-2010, 11:47 PM   #6
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The reason I'm not impressed with HSM/SDM is the added likelihood of AF failure... not to mention the longer focus hunting compared with screwdrive lenses.

Once SDM is faster than screwdrive counterparts and more reliable than what the track record has been for previous lenses, then I'll be more interested.
08-02-2010, 11:58 PM   #7
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Im still pissed that sigma has no plans on releasing the Sigma 150mm F/2.8 macro in Pentax mount.
08-04-2010, 02:29 PM   #8
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Thank you for choosing Sigma products.

At this time there are no plans to put HSM for the Pentax mount on this lens.

We apologize for the inconvenience.


Desiree Gaige
Customer Service/Technical Support
Sigma Corporation of America
15 Fleetwood Court
Ronkonkoma, NY 11779
(631)585-1144
dgaige@sigmaphoto.com
www.sigmaphoto.com

08-05-2010, 04:28 AM   #9
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As Sigma adds HSM/OS to their lenses, they bump the prices up. Look at the difference in price between the old version of the 17-70 and the new version. As far as I can tell, even Sigmas high end HSM motors don't really add any speed to auto focus -- most is dependent on the camera algorithims. The only thing it adds is quietness.
08-05-2010, 05:54 AM   #10
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QuoteOriginally posted by Marc Sabatella Quote
Means they'll be unnecessary big, heavy, and expensive
How do you figure?

The Sigma 30mm in EF mount has HSM and is cheaper than the Pentax mount version.
08-05-2010, 07:38 AM   #11
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QuoteOriginally posted by CWyatt Quote
Does anyone know why Sigma continue to make some of their Pentax-mount lenses without HSM, while the other mounts of the same lens have HSM?

Mostly I'm referring to the 30mm f/1.4, which costs the same in Pentax-mount, without HSM. As far as I know, Pentax has been compatible with HSM since firmware 1.03 on the K10D. I realise Pentax-mount must be a very small part of Sigmas business, and there has been some progress, for example the latest 10-20mm is HSM for Pentax.

I've asking Sigma why they're still producing non-HSM for Pentax - will let you know what they reply.
As far as I know, since the split between sigma and pentax over lens mount design at the introduction of SIGMA AF in the 1990's, sigma has not paid any lisencing fees to pentax for the use of the pentax mount.

They reverse engineer things. As a result they are perhaps not the most favorable towards selling to pentax users.
08-05-2010, 09:04 AM   #12
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QuoteOriginally posted by fractal Quote
How do you figure?

The Sigma 30mm in EF mount has HSM and is cheaper than the Pentax mount version.
Well not by much, mainly b/c the production volume is much higher that they can offer it cheaper. Also, I think marc referred mainly to OS, which defintely does put on more weight than a lens without it.
08-05-2010, 10:13 AM   #13
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QuoteOriginally posted by yeatzee Quote
Im still pissed that sigma has no plans on releasing the Sigma 150mm F/2.8 macro in Pentax mount.
I agree with you on that!
08-06-2010, 01:16 AM   #14
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QuoteOriginally posted by GLXLR Quote
Well not by much, mainly b/c the production volume is much higher that they can offer it cheaper. Also, I think marc referred mainly to OS, which defintely does put on more weight than a lens without it.
Yeah, that makes sense.

As far as OS is concerned, I don't believe it is available for the 30/1.4. Would you need really it?
08-06-2010, 01:05 PM   #15
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QuoteOriginally posted by yeatzee Quote
Im still pissed that sigma has no plans on releasing the Sigma 150mm F/2.8 macro in Pentax mount.
I gave up waiting a few weeks ago when a180mm f3.5 came up on Ebay very cheap.
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