New Sigma 70-300 with autofocus issue


Link Posted 17/08/2013 - 00:39
Hi all,

When I put a new Sigma 70-300mm F4-5.6 APO DG macro lens on my K30 it's asking for the focal length, I can use the lens manually but autofocus doesn't work. I was wondering if it's a faulty lens so the camera is not detecting it as a AF lens?

Any help would be appreciated.



Link Posted 17/08/2013 - 00:56
If it's new, yes, I'd recommend a replacement from where you bought it from.

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Pentax K5 | Samsung N9005 | DA 18-55 WR | DA 35 2.4 | DA 50 1.8
Tamron 10-24 SP | Tamron 90 2.8 Macro | Tamron 70-300 Macro
Samyang 85 1.4 ...and a few other manual lenses older than me.


Link Posted 17/08/2013 - 08:21
tried cleaning the camera and lens contacts?


Link Posted 17/08/2013 - 09:00
Yes I did to be sure that's not causing the issue. Assuming it would have been ok anyway as the lens is brand new (just out the box) and the camera is only 7 weeks old and works perfectly with Pentax lenses.


Link Posted 17/08/2013 - 09:06
AF switch on?
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Link Posted 17/08/2013 - 09:28
Yes it is.


Link Posted 17/08/2013 - 11:18
Try turning the aperture ring if it has one - my old version of this lens sometimes plays up and that is needed is a quick turn on the aperture ring then return it to the 'A' setting then all is ok

However, as it is a new lens it would be sensible to send it back for repair or replacement
K10D, K5 plus plenty of clueless enthusiasm.

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Last Edited by Stuey on 17/08/2013 - 11:18
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