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08-04-2020, 05:30 PM   #1
Wayne Bonn

F* 300mm F4.5

Camera k-5 doesn't see the focal length. With lens mounted the LED display flashes and the focal length display shows (F---). Also doesn't work in green mode. Everything else seems normal . Pic quality is great. Any ideas?

08-04-2020, 06:26 PM   #2
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Make sure the contacts on the lens as well as on the camera are clean. You can carefully clean them with a pencil eraser. Also make sure the lens is properly mounted and it clicks all the way in.

08-04-2020, 06:28 PM   #3
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If the camera is showing (F__) it does not see the lens.

Carefully clean the contacts on the lens and on the camera mount. A soft microfiber cloth usually works just fine. A little alcohol on the cloth can help but is usually not needed, just buff them first before you resort to alcohol.

If that doesn't work carefully examine the contact buttons and see if they are all present and in good shape.
08-04-2020, 08:08 PM   #4

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Make sure the aperture ring is set to A

08-05-2020, 05:53 AM   #5
Wayne Bonn

Cleaned contacts - no help. Tried lens on different camera body - same problem.
Set aperature ring to A - success!!

Thanks for the help.

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