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11-27-2011, 06:03 PM   #1
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K5, K7 shake reduction and sigma 24-70 DG HSM

Hi all,

Most of the time I have shake reduction turned off, except low light with zoom lenses, but somehow I had shake reduction turned on this time with this lens and pictures came blurry.
So I made couple shots with and without SR, with shutter set to 1/25 (lens at 70mm) pictures without SR came better than with SR. After that I started to wonder how does it works with other lenses, I have tried Sigma 70-200 pentax 18-250 and for both pictures with SR looks sharper than without.
I'm just curious if owners of sigma 24-70 may confirm that (I have same results on K5 and K7) or my lens is not giving the body correct focal length and SR is making wrong moves.
Thank You.

11-27-2011, 08:46 PM   #2
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I'm always willing to run a test so I just popped the Sigma 24-70/2.8 HSM onto a k-5 and ran multiple sets of comparisons at 1/25s and 70mm. Hand held but elbows on the table. At 200% I can see no consistant difference between the SR on and SR off frames. Would be interesting to see your examples to understand just what kind of blur you encountered.
11-27-2011, 08:54 PM   #3
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I switched from Canon 5D MKII and initially I found most shots less sharp with SR ON. I shut it off and no problems, nicely sharp. However, now that I am more accustomed to the K5 I have no problems.I think it was the difference in gripping the smaller body, and smaller primes. YMMV
11-28-2011, 08:33 PM   #4
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Thank you for making shots with your lens imtheguy.
Based on posts I have seen (on this forum) it looks like I have older lens that is not fully compatible with camera, can't be used with live view (no focus), and SR makes static object looks like something was moving pretty fast. Theoretically sigma corrected this in new firmware, so I will have to contact them and probably send my lens for update.

11-28-2011, 09:20 PM   #5
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You are welcome. I could very well be mistaken but if the EXIF of your shots indicates the focal length you selected by zoom, then I dont understand why SR would not work correctly since any old totally manual lens benefits from SR when you just plug in the value. If your EXIF indicates 00mm or something then it makes sense. By the way, rechipping a lens is not a big deal and hopefully is covered by the warranty anyway (mine was). Best of luck in getting it straight.
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