K-01 and K5-II Contrast AF problems

Started May 5, 2013 | Discussions thread
brandrx Forum Pro • Posts: 28,337
Re: K-01 and K5-II Contrast AF problems

Hi Phil,

Unfortunately some lenses just don't work worth a damn using CDAF. For instance: My Sigma 50-500mm APO HSM OS at 500mm trying to focus on a subject that is greater than 150 feet will indicate focus lock if I am coming from a setting that is less than 150 feet on the lens to start with but the resultant image is very OOF. If I start my focusing with the lens set to infinity then it will lock focus on the subject that is greater than 150 feet and it will be sharp.

From what little information I have been able to gather so far, it seems the problem is more common with Tamron and Sigma lenses than with Pentax lenses.

Good luck.


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