Question about Sigma 28-70mm f/2.8-4.0 DG for Sony A100K, A100

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Auto-focus lens now only worka mNUlly

With Sigma 70-300 on Alpha-100, when the camera is turned on or off the lens makes a rapid clicking noise for about 5 seconds then silence. If the camera was turned on in an auto-focus mode after the noise it indicated it is in manual focus mode. The lens can be focused manually but does not go smoothly through the close-infinity range.

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  • tewargin Jun 25, 2009

    Camera off, set to manual focus.

    Mount lens.

    Turn on camera.

    Noise for 5 seconds.

    Lens works in manual mode.

    Set camera to auto focus

    LCD still says manual focus and lens still works manually.

    Set camer back to MF

    Turn off camera may or may not get noise.

    If lens not at infinity and camera turned on - lens goes to infinity then makes noise.

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This is not going to get into manual, provide in it is check its angle line to see some if you use the lens connected correctly to your camera. this is happen when you are not inserted it properly. this time call an assistance to guide and fix your lens. this problem now does not belong to the manual. Its an accident that lens are defective or factory defect. Hope might this well help you. Good luck!

Posted on Jun 26, 2009

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Put your camera / lens is in MF mode then check if the issue persists...

Posted on Jun 25, 2009

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