Made A Hartman Mask To Improve Astrophotography Focus

It looks like it should work. It is certainly the case that two holes in the mask at the front of the telescope produces two separate images out of focus--and one image when precisely at focus.

Okay, the sky is clear (or clear enough), the telescope is reasonably well polar aligned--and then I discover that I left the Pentax on while downloading pictures, and apparently it doesn't power itself off in that mode, so I was already to go, but with no ability to take pictures. Groan.