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11-12-2009, 05:59 AM   #1
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New Sigma 70-300mm lens for Pentax

Quoted from DPReview.

QuoteQuote:
Sigma Japan has announced the availability of its 70-300mm F4-5.6 DG OS image-stabilized telephoto zoom lens in Sony and Pentax mounts. The lens is suitable for use on both APS-C and full frame DSLRs. Priced at 59,000 yen, the Sony version will start shipping from November 27, 2009 followed by the Pentax version from the first week of December 2009.
59,000 Yen translates to 440 euros, or 660 dollars.

11-12-2009, 06:27 AM   #2
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They say their OS will work on the cameras with sensor shake reduction - I wonder if two SR systems working together will be better then one? Or maybe they will 'fight'?
11-12-2009, 06:47 AM   #3
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QuoteOriginally posted by ixian Quote
They say their OS will work on the cameras with sensor shake reduction - I wonder if two SR systems working together will be better then one? Or maybe they will 'fight'?
Both together doesn't work. I'm glad that Sigma's decided to use OS in Pentax mount lenses.

They didn't mention anything about the design of the new 70-300. I expect it's the same optical formula as the old 70-300 APO. Maybe they've taken the opportunity to tweak the performance too.
11-12-2009, 07:09 AM   #4
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QuoteOriginally posted by audiobomber Quote
Both together doesn't work. I'm glad that Sigma's decided to use OS in Pentax mount lenses.

They didn't mention anything about the design of the new 70-300. I expect it's the same optical formula as the old 70-300 APO. Maybe they've taken the opportunity to tweak the performance too.
From Sigma UK website:
"For Sony and Pentax mount, the built-in OS function of this lens can be used even if the camera body is equipped with an anti-shake function."

Nothing about switching SR off for OS to work... I'm not saying they can work together, I just couldn't find any definite answers.

This lens is new design - 16 elements and no macro function.

11-12-2009, 07:10 AM   #5
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Both work good.
Cool Stabilization test with surprises: Lens vs Sensor-shift (Pentax K7 and Olympus E-P1) - 1001 Noisy Cameras


K-7's results are better than only with SR ON.

Not blur photos/ Blur

The lens image stabilization ON / ON: In-body image stabilization 16 14

The lens image stabilizer OFF / ON: In-body image stabilization 11 19

Last edited by ogl; 11-12-2009 at 08:03 AM.
11-12-2009, 07:56 AM   #6
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QuoteOriginally posted by ogl Quote
Both works good.
Of curiousity interest are the Pentax K7 results where the double anti-shake test (both sensor-shift and lens-stabilization turned ON) performed much better than one would have thought, especially compared to the single-ON tests.

Also of interest, the E-P1 did quite well with stabilization turned OFF, while the double anti-shake test was (as expected) a disaster.


That's a shock. I had seen a video of an Olympus in-body system with and without stabilized lens and use of both was definitely a disaster. The Pentax shake reduction system doesn't seem to work in the same way. Good to know, but needs more study as stated in the article.
11-12-2009, 08:03 AM   #7
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it's BONUS for Pentax.
11-12-2009, 10:20 AM   #8
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well, I doubt it will be profitable to sigma. who of you do not trust? pentax sr?
I do.
why would I pay extra money for the one model, that has image stabilization, when I have it in the body, I would buy an older lens model..

of course if this lens has more surprises in IQ then pentaxianst might buy it.. but if not.. then.. Sigma will loose the money that they spent, in fitting this lens to pentax mount...

11-12-2009, 10:56 AM   #9
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Only one will work!

QuoteOriginally posted by ixian Quote
From Sigma UK website:
"For Sony and Pentax mount, the built-in OS function of this lens can be used even if the camera body is equipped with an anti-shake function."

Nothing about switching SR off for OS to work... I'm not saying they can work together, I just couldn't find any definite answers.

This lens is new design - 16 elements and no macro function.
We can only choose one or the other, NOT both.
Here is the quote from Sigma Japan website:

* For Pentax and Sony mount, it is not possible to use AF and the stabilizer function (OS) when attaching to film SLR, Pentax ist* series and K100D DSLR cameras. When the OS function of lens body is used, please turn the stabilizer function of camera body off.

Here is the link (Look at the end of the Specifications box:
High ratio zoom lens housed in a compact construction and incorporating Sigma's original OS (Optical Stabilizer) function. 70-300mm F4-5.6 DG OS - SIGMA CORPORATION
11-12-2009, 11:33 AM   #10
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QuoteOriginally posted by HermanLee Quote
We can only choose one or the other, NOT both.
Here is the quote from Sigma Japan website:
CORPORATION[/url]
The real life says other things...
11-12-2009, 11:43 AM   #11
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QuoteOriginally posted by ogl Quote
The real life says other things...
Heck, if I own that lens I'll be testing it in any way it's possible.
It's my lens and I love experimenting otherwise I won't end up with so many Pentax equipments
11-12-2009, 12:31 PM   #12
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it was tested on K7. How about if it was tested on K200D and Kx? what would be the resulsts?
11-12-2009, 01:09 PM   #13
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that test result is speaking against the physics behind SR so I don't belive it until a trusted person like Falconeye tries it.

This is in the "the world is flat" class. A web page claming it to be flat don't do it for me.
11-12-2009, 04:06 PM   #14
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i wonder from where does OS draws power for its gyro-sensor and lens stabilization parts - probably from PowerZoom/SDM contacts, that's the only reasonable place with enough current.
11-12-2009, 06:19 PM   #15
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QuoteOriginally posted by elkarrde Quote
i wonder from where does OS draws power for its gyro-sensor and lens stabilization parts - probably from PowerZoom/SDM contacts, that's the only reasonable place with enough current.
I hear the focusing pin winds up an in-lens generator...
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