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02-14-2013, 10:01 AM   #1
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K100D Tameron 80 210

I just purchased my very first DSLR, a Pentax K100D. I was looking for an affordable way to get into digital photography, and found a previously owned K100D on Ebay. The camera came with a kit lens 18 55. I also purchased a Tamaron 80 210. the lens came with a Pentax adpater, I admit, I don't understand how to adjust the adapter. When I lined up the contacts the lens snapped into place. But the lens does not seem compatible with the camera. I see a flashing AV, and nothing through the view finder? What am I doing wrong?

02-14-2013, 11:48 AM   #2
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Join Date: Jun 2010
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Hello migrantriver and welcome to the world of Pentax DSLR photography!

What you got is in all likeliood an Adaptall-2 lens with a custom mount for Pentax K-mount lenses (P/K). There is also the chance that you have got a lens for the Pentax KA-mount lenses (P/KA). Other than the engaving on the mount, you can tell the difference from the very look: P/KA mounts have lectrical contacts while P/K mounts have none. Take a closer look here:

Tamron Adaptall and Adaptall-2 Custom Mounts

Assuming that it is indeed a P/K mount, your lens will effectively be a fully manual Pentax K-mount lens. How to operate that, you can see here:

https://www.pentaxforums.com/forums/pentax-beginners-corner-q/110658-using-ma...x-dslrs-f.html

https://www.pentaxforums.com/forums/pentax-beginners-corner-q/60081-usage-green-button.html

Do note, that you will have to operate your K100D in manual (M) mode and that you will have to set "Aperture Ring Permitted" in the Camera Customs Menu.

It can be very rewarding to use these vintage Tammron Adaptall lenses on a modern DSLR. May I suggest that you browse the Adaptall Club pages in this forum for inspiration:

https://www.pentaxforums.com/forums/lens-clubs/59769-adaptall-mount-club-tamron.html

Congratulations with your purchases - and enjoy!
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