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06-15-2013, 07:32 PM   #1
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Focussing problem Sigma EX 70-200mm 1:2.8 II MACRO HSM

I am experiencing problems with this lens's auto-focus on objects greater than 40 metres away. AF works perfectly on objects at lesser distances but will not lock onto anything at approx 40 metres or greater distances, unless I first manually set the focus to infinity.
  • If focus is set to 10 metres the lens will auto-focus on anything from 1 metre to 20 metres.
  • If the focus is manually set to 10 metres the lens will not auto-focus on an object at 40 metres or greater distance.
  • If the lens is manually set to infinity it will auto-focus on an object at approx 40 m
  • If lens is manually set to to infinity it loses focus on an object at infinity.
Auto-focus on my other non-HSM lenses is working perfectly.



Camera is Pentax K-7
Firmware V1.12

Having just got the lens back from a 6 week warranty repair for a total HSM failure, I am reluctant to send it off again if there is something I can do to rectify the problem. Any advise would be appreciated.


Last edited by Bruce Clark; 06-15-2013 at 07:35 PM. Reason: omitted one variable
06-16-2013, 12:18 AM   #2
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Contact the repair shop you clearlyhave a faulty lens
06-18-2013, 06:22 AM   #3
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QuoteOriginally posted by adwb Quote
Contact the repair shop you clearlyhave a faulty lens
Thanks, hoping against hope for a simple solution. I have contacted the local service centre and will take camera and lens in for calibration.
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