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Fellow Pentaxians, forgive my ignorance. I was given a Sigma lens for Nikon Mount by a family member as follows:
Sigma Telephoto 500mm f/4.5 EX DG APO HSM Autofocus Lens for Nikon AF .
This is a huge hunk of glass & probably has some value. Problem is, I don't own a Nikon camera. Is there such a thing as a Nikon to Pentax adapter? I know he thought he was doing me a great favor, so I just grinned and sheepishly accepted it with great thanks, and tucked it away in my suitcase. I knew it wouldn't mount on my Pent K-mount, but thought there might be a way to adapt and use manually?? Any help here?