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06-26-2012, 04:35 PM   #1
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Trouble auto-focusing with K7 SLR and Tamron 18-200mm lens

I recently purchased a Tamron 18-200mm lens for my Pentax K7 and have had it replaced once for the same problem. The lens will not consistently autofocus between 18 and approximately 35 mm. It performs slightly better in 'C' mode. The camera works perfectly with my 3 other Pentax lenses. I bought this lens for travel, however now I'm afraid to depend on it. Any suggestions???

06-26-2012, 10:01 PM   #2
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What do you mean by will not consistently autofocus? Does not lock focus or misses focus?
06-27-2012, 10:00 AM   #3
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Trouble auto-focusing with K7 SLR and Taron 18-20mm lens

Sorry for the lack of clarification. The photograph appears to be in focus through the viewfinder/LCD and the 'hand' indicator appears to confirm. However, no 'red light' appears and the shutter won't open/close and take the photo.
06-28-2012, 07:53 AM   #4
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I'm having a similar problem with my K10d and the Tamron 18-200. it happens more near 200mm zoom. I'm going to also contact Tamron.

07-01-2012, 08:06 PM   #5
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I had a similar issue with this lens on my wife's K100D. Motor would turn, would "almost" focus, but apparently not quite because the shutter wouldn't fire. Worked fine on my K200D. Never looked into it further.

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