I have a similar situation, but no Pentax. I've been trying to figure out how to scan thousands of my grandfathers slides. Too expensive to send out for processing, I think. But there don't seem to be any good auto-feed scanners and the thought of scanning 5000 slides five at a time is daunting! It's annoying that the slides are all in trays for automated playback with a slide project, but there are no scanners that feed from trays!

I'm thinking of setting up a slide projector on auto play and recording that output. At least that would batch by fifty.

Any suggestions?