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using manual lens on K20D

Jordan Tyler , May 20, 2009; 03:31 p.m.

Just the the M 50mm f2.0 lens in that I orderd and put it on my K20D to take a few quick pics. When I got it connected and turned to manual focus the only thing that is happening is the f is flashing on the top screen of camera. Now my wife decided to throw the box to the camera away which had my manual and software in it so what I need to know is what do I do to get the lens functional. Thanks for the help.


John O'Keefe-Odom , May 20, 2009; 03:47 p.m.

Jordan, on the K200D I had to go into the "Custom Settings" menu and find a function that allowed me to turn on a function called something like, "Aperture Ring""Enable" for the metering. You may need to do something similar with your camera.

Check out these posts, and you'll find a list of some stuff that might help you; they're for a K200D, but I imagine you'll see something similar in the K20D menus:

http://photo.net/pentax-camera-forum/00SUOg and (link) and (link) Last two links are some of my blog pages that effectively reprint the same list. J.

Peter Zack , May 20, 2009; 03:48 p.m.

Jordan, The lens and camera are fine. But since it's an M series lens, you first have to go to the custom setting menu and find Allow Aperture ring. Set to permitted. Then you will shoot the lens in either AV or Manual. The other modes only work with A, F, FA, DA, DFA, and DA* lenses. M and M42 lenses only work in M and Av modes using the green button to assist in exposure estimation.

Michael Elenko , May 20, 2009; 03:49 p.m.

You can download the K20D manual from the Pentax site as a PDF. I always have a copy on my smartphone just in case.
In the Menu/Custom Setting/No. 36 Using Aperture Ring choose 2-Permitted. That allows the camera to read the aperture values as you rotate the ring.


Andrew Gilchrist , May 21, 2009; 12:17 p.m.

The advice for downloading and keeping the manual is good. The custom setting Michael E. mentions is right. However the camera won't read the aperture values as you rotate the ring with any lens--this is what people mean when they say the Pentax D-SLRs have 'crippled mounts'.

You may want to refer to this thread and this thread .

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