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06-12-2018, 09:26 PM   #1
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Are there problems with auto-focus on Pentax DFA 70-200 lens?

My pentax DFA 70-200 f2.8 refuses to focus on either my K-1 or K-3. The dial moves to infinity and just stays there as if it's slipping, refusing to find focus.

06-12-2018, 09:56 PM   #2
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QuoteOriginally posted by hugonut Quote
My pentax DFA 70-200 f2.8 refuses to focus on either my K-1 or K-3. The dial moves to infinity and just stays there as if it's slipping, refusing to find focus.
No known QC issues, though it sounds like your copy may have some defect. Have you performed AF fine tuning?

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06-12-2018, 10:14 PM   #3
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Is the Focus Range Limiter switch set to 4m - infinity?
06-12-2018, 10:57 PM   #4
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I have not used af fine tuning focus seemed to work well except till about 3 weeks ago. Great lens before this came up, should Im try AF fine tuning?

06-12-2018, 11:31 PM - 1 Like   #5
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QuoteOriginally posted by hugonut Quote
I have not used af fine tuning focus seemed to work well except till about 3 weeks ago. Great lens before this came up, should Im try AF fine tuning?
I would start by checking the position and operation of the focus limiter and QS/M settings. Then clean the contacts on the lens with alcohol. The AF-FA settings on your camera won't help if if is refusing to focus at all.
06-13-2018, 09:07 PM   #6
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Thanks everybody for your help but I've tried all, I think it is a mechanical defect, cheers
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