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01-05-2011, 02:01 AM   #1
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K-5 with Sigma lens - Manual focus not working

I just got my much awaited Pentax K-5 today. I bought the a Sigma 28-70mm ASF EX f/2.8 about a month ago, bought new even thought it's an older lens.
The Auto Focus is working fine, however, when I turn it over to manual on the camera, it won't focus, the ring just turns freely.
As the lens is older, the inbuilt lens aperture setting has to be set to 'A' for auto, or the camera won't recognise that there is a lens connected. Could this be a part of the problem?
Does anyone have any suggestions?

Last edited by Jyved; 01-05-2011 at 02:06 AM.
01-05-2011, 03:16 AM   #2
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Lowell Goudge's Avatar

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the focusing collar has a clutch, to engage manual focus pull back slightly on the collar. it should slip back about 1/8 of an inch, to go back to AF push the collar forward. This disengages the collar whern in AF so you don;t try to override the motor
01-05-2011, 04:13 AM   #3
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Thanks! Such simplicity
Can't wait to have a proper play around with my camera now.
01-10-2011, 02:39 PM   #4
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Jyved: Oui c'est le meme systeme aussi sur certains Tamrons (ex Tamron SP 90 Macro)
Au cas ou ca arrive a d'autres utilisateurs.


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