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05-10-2016, 05:18 AM - 1 Like   #16
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Join Date: Jan 2011
Location: Sao Paulo
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Posts: 115

A fresh battery is a good point. I had started with a fresh battery for the baseball game I was shooting and experienced the problem after 750 shots. Maybe the battery is the problem. (They are orig. Pentax batteries.)
750 shots is closer to max autonomy of that battery...

Also, I have a K5II, but had a K5 before with two OEM batteries. I sold it, but by mistake,I put the less used battery in the pack and keept the original and older one that was bundled, so it is a very first batch.

So, when they are getting closer to depletion, I can measure the speed of the AF becoming slower. With pull charge, the AF is a hell of a speed demon. Well, with the 16-50 screwdrived, at least, who's my most used lens. Can't garantee is the same with mine Sigma 70-200 hsm, but some times I can fell some hunting.

02-27-2019, 02:27 PM   #17
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Join Date: Jun 2018
Posts: 14
QuoteOriginally posted by Not a Number Quote
Point the lens straight up or down so the weight of the camera or lens is evenly distributed on the mount and see if that makes a difference.

Perhaps all you need is to tighten the screws a touch on the mount, camera and or lens.
I have just fixed a very similar issue by tightening the lens mount screws, thank you Not a Number!

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