spronju_lator

<p>That's interesting.<br> Other users found that in PhotoMe they were able to see SRFocalLength in the Manufacturer Notes field for the K-5, K5-ii and, I think, some other models, but it was not visible for the K-3. And, the values passed were wildly off under 31mm.<br> Everyone on PentaxForums.com who did the 1/15 sec test found that sharp results were possible at 17mm without SR, but much more unlikely with SR. It's interesting that you got a different result.</p>

<p>There appears to be a problem with the Pentax version of this lens. Under 31mm it is communicating the wrong SR Focal Length by a very large margin. This introduces blurring when SR is on. Please check the following thread about it on PentaxForums.com. It has been verified by a number of users with the lens on different Pentax models.<br> <a href="http://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/285104-sigma-17-70-contemporary-compatibility-problems-shake-reduction.html" target="_blank">http://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/285104-sigma-17-70-contemporary-compatibility-problems-shake-reduction.html</a><br> If you own the lens, please check it out. Also, I would suggest that you contact Sigma to inform them of this problem so that that can issue a firmware fix to send the right SR Focal Length.</p>