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05-11-2010, 05:39 AM   #1
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pentax 17-70mm SDM focus problem

hello, i've got a new DA17-70mm,f4. but found that a problem with very slow speed when focus at range 50-70mm.
sometimes, i need to shift the focus one twice or more, or zoom-out to range 17-50mm to get a fast focus first, then zoom-in back to 50-70mm to take photo.
just wish to know if anybody get the same problem as me?
i'm using k20D with it, can i fix this myself?

05-11-2010, 08:24 AM   #2
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Sounds familiar.

I don't think it's anything you can fix yourself. If you can return the lens and get a new one, that's your best option at this point.

Last edited by dgaies; 05-11-2010 at 08:25 AM. Reason: fixed link
05-16-2010, 04:41 PM   #3
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17-70 focus problem

I am having the same problem with this lens. I've tried it on a K100D Super & K-7; both cameras have great difficulty in achieving focus lock. It's driving me nuts--not sure if it's the camera(s) or the lens. I've attempted to fine tune the AF with the K-7, but nothing seems to work. I wonder if it's a fixable problem?
05-16-2010, 08:34 PM   #4
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thanks. trust i should take it back for repair.

05-17-2010, 12:59 AM   #5
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Try to add some friction to the focus ring by letting a finger slide against it. See if it locks quicker, if it does, be sure to describe the problem properly when sending it off to service.
05-17-2010, 06:49 PM   #6
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That seemed to ease the problem almost completely...what gives?

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