K20D and SMC Pentax-M Lens Compatibility?

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Joel Batts
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K20D and SMC Pentax-M Lens Compatibility?
3 months ago

Hi Everyone,

I'm new to this forum.  I bought a used 50mm Pentax SMC-M lens and put it on the K20D body...it didn't work!  When I turned the camera on, the number of shots remaining came on and flashing 'F--'  Nothing else displayed, no shutter speed.  Nothing happened when I turned the front and rear dial in an attempt change the shutter speed.  'F--' kept flashing.

Do I need to change the camera setting in the main menu so the camera would recognize the lens?  I didn't have to change  anything in the main menu when I installed the Pentax screwmount lens via adapter.

So do I have a bad Pentax-M lens or this type of lens is not compatible with K20D?  My K5 II should be here tomorrow from B&H!!!

Thank you!

Pentax K20D Pentax K-5 II
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