[alpal]

Originally Posted by jwoody

Astro Photography Tool (Free version http://ideiki.com/astro/Default.aspx will integrate with PHD and auto dither, might be worth a look

Dunno - but they look like the sort of people who could manage the job.
It depends if the QHY9m allows for a software controlled camera shutter close & open without download of frame.

cheers
Allan