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05-12-2009, 01:45 AM   #1
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Why wil my sigma 18-200 not auto focus?

I have a K200D brought in November and have used it quite often with the above lens with no problems. I have been using manual lenes like a 50mm 1.4 and then put the sigma back on and it doesn't let you use auto. The sutter release will not activate any focusing when half pressed?
Any ideas?

regards

05-12-2009, 01:51 AM   #2
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Moved to SLR Lens Discussion forum.
05-12-2009, 02:18 AM   #3
Dom
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I'm sure you've already tried this but is the lens/camera set to manual focus?

As I said I'm sure you've already checked but some times it's the simple things.
05-12-2009, 02:26 AM   #4
zak
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Dom thanks. I have tried that. I didn't know if I could have changed the setting in the custom setting but I am sure that I have changed lenes before with no issue. I may take it in to get serviced.

05-12-2009, 12:54 PM   #5
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Have you accidentally moved the aperture ring off the "A" position?
05-12-2009, 01:56 PM   #6
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Did u disable the shutter button half press AF feature. Try to reset camera setting to default and retry. Or did you turn back on AF on the body.
05-12-2009, 08:17 PM   #7
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QuoteOriginally posted by Marc Sabatella Quote
Have you accidentally moved the aperture ring off the "A" position?
That's what I do. It's always good for a few moments of sweating and worry unitl I figure it out.

Did you try cleaning the contacts on the lens and camera?
05-13-2009, 01:50 AM   #8
zak
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Thanks for all your help. Winglik was spot on. I reset the default settings and it is now working. I will look into the settings more carefully next time....thanks again

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