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03-06-2014, 04:26 AM   #1
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Trouble mounting Sigma Lens

I have a Pentax Kx which has a standard Pentax 18-55mm lens and I only use the Auto Picture Mode.
I have just purchased a Sigma APO 70-300mm F4-5.6 DG MACRO Lens.
When I mount the Sigma Lens, then the display says Av Aperture Priority Automatic Exposure and I can't use the camera.
If I exchange back to original lens then the display is back on Auto Picture Mode and camera operates.
What am I doing wrong?

03-06-2014, 07:29 AM   #2
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The Sigma lens has an aperture ring. Is the ring set to the 'A' position? There is a small button on the ring that has to be pressed to position the ring on 'A'.
03-06-2014, 07:30 AM   #3
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Does the lens have an aperture ring? It must be set to the A position to work properly in all modes.

If it doesn't have an aperture ring or it is already set to A then the contacts are likely dirty.
03-06-2014, 10:16 PM   #4
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QuoteOriginally posted by boriscleto Quote
The Sigma lens has an aperture ring. Is the ring set to the 'A' position? There is a small button on the ring that has to be pressed to position the ring on 'A'.
Thanks very much. Needed to be set to A position. Works fine now. Thanks again.

---------- Post added 03-07-14 at 04:17 PM ----------

QuoteOriginally posted by elliott Quote
Does the lens have an aperture ring? It must be set to the A position to work properly in all modes.

If it doesn't have an aperture ring or it is already set to A then the contacts are likely dirty.
Thanks very much. Needed to be set to A position. Works fine now. Thanks again.

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