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05-10-2018, 07:47 AM   #1
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Aperture problems with Pentax SMC P 18-250mm f/3.5-6.3 DA Lens

Hi everyone, I was wondering if anyone can help me????

I have a pentax K20D and am having problems with the aperture not stepping down when I take a photo or I use the DOF preview. It stays open at the maximum. I have taken the lens off and I can manually move the lever which seems normal. When I use the DOF preview the lever in the camera moves as normal. I have put on an old manual 50mm lens and everything works fine. ie DOF preview, exposure, ect.

I have looked at the aperture levers in the lens and everything works fine.

Has anyone an idea what could the problem be??

Looking forward to your input.

Wazza


Last edited by BigMackCam; 05-10-2018 at 08:50 AM. Reason: Corrected title
05-10-2018, 07:56 AM   #2
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Try cleaning the electrical contacts on the lens mount. Does the aperture setting show in the viewfinder or "F - -"? The latter would be an indication that the lens is not communicating with the body.
05-10-2018, 08:05 AM   #3
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I have just re cleaned the contacts and in the display "Av"at F11 when you press the shutter half down the whole display flickers and the F11 changes to F-- as it is flickering.
05-10-2018, 09:33 AM   #4
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The f-stop display should hold steady in Av mode. Try cleaning the contacts on the lens again as well as on the body. Check to make sure neither the mount on the body or lens is loose. It could also be a slight alignment problem so try gently twisting the lens back and forth while it is mounted and the meter active.

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