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03-27-2014, 08:06 AM   #1
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Changing a lens

Hi.
Yes, I have read the manuals, but when changing lenses on my K20D Digital camera, new lenses will not work with the camera body - it starts flashing an F in the display area. This now happens with the original lens it came with. Any help anyone?
Thanks.

03-27-2014, 08:15 AM   #2
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https://www.pentaxforums.com/forums/58-pentax-beginners-corner-q/110658-using...x-dslrs-f.html

You have to tell the camera to allow a manual aperture ring.

It can also happen if the contacts are dirty - you might want to give them a quick cleaning with a damp soft cloth.
03-27-2014, 08:17 AM   #3
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Make sure the aperture ring on the lens is in the "A" position if it has one. If not then read the article noted above.
03-27-2014, 08:32 AM   #4
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Dirty contacts are most likely your cause.

03-27-2014, 08:40 AM   #5
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Did you actually mount properly? The lens makes a "click" when you do.
03-27-2014, 11:54 AM   #6
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Dismount the lens.
-make sure the mount on the lens and the camera are both clean, without grime or dust
-mount the lens. You put it in, then you turn until it makes a click sound and locks into place. You need to let go of the mount button for it to click.
-if the lens has an aperture ring (not zoom ring, not focus ring. Aperture ring is labelled with f-numbers), you need to go to Menu and find the "Allow aperture ring" option - its usually at the very end
-if the aperture ring on the lens has an A option (literally, it says A), you need to press the button on the aperture ring and lock it into the A position. Now you will select the aperture on the camera body. If the lens doesn't have that, you have to select the aperture on the lens, by hand. If you have to select it by hand, you are limited to M mode and Av mode (Av mode will meter continuously, but will always take photos at widest aperture, M mode will only meter when you press the green button, but it will use the aperture you selected on the lens)

Btw, there are a couple threads about using manual lenses. TER-OR posted one, they usually have good instructions. If you don't understand it, just search the forums for another thread/tutorial. It takes some getting used to, but its easy once you get to know how
03-28-2014, 12:16 AM   #7
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If it is happening with the original lens the camera came with, my money is on the OP inadvertently switching the lens off of "A." Second choice, dirty contacts.

OP, can you tell us what lenses you have tried and what the "original" lens is?
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