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12-02-2009, 12:57 AM   #1
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Focus problem with Sigma Zoom 28-80mm 1:3.5-5.6 Aspherical AF lens

I am having problems trying to focus with this lens in both AF and MF on my K10d
Set to MF, Mode = M, the focus ring cannot be moved manually and seems to be either locked or jammed on the MFD lens setting, shots taken are out of focus or blurry.
Set to AF-S, Mode = Av, or Sv, or Tv the camers adjusts to appropriate ISO, f-stop, and exposure settings however the camera will not autofocus the lens, seems to be jammed or locked on the MFD lens setting, the in focus indicator is flashing, shutter release is disabled, therefore a shot cannot be taken.
Firstly, do I need to set specific options in the K10D custom settings, alternatively is the lens the culprit,or does the camera require a service to calibrate the autofocus functions.
BTW, the firmware is Version 1.30

12-02-2009, 08:35 AM   #2
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Sounds like the lens is busted. It's not that great of a lens anyway. Pick up a Pentax 18-55 and call it a day.

Can you move the focus ring when the lens is OFF the camera?
12-02-2009, 08:46 AM   #3
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That specific lens has a "macro" lock at full 80mm.
You might have missed that and should unlock it first.
Flick the switch to "normal".
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12-02-2009, 05:38 PM   #4
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Focus problem with Sigma Zoom 28-80mm 1:3.5-5.6 Aspherical AF lens

Thanks for the feedback!

Firstly the lens was purchased new in 2000, and is a straight zoom lens without macro features.

The Pentax DA 18-55 Zoom looks to be a better fit, is there much difference between the Standard kit lens and the WR version in terms of build, function, and optical quality. Is the WR worth the extra money?

12-02-2009, 05:45 PM   #5
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BTW - I cannot move the focus ring manually off the camera

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