Ioptron sells a Polemaster rebadged with their own brand name. It looks identical though. Some of the info you need is on a table at the end of this PDF manual.
http://www.ioptron.com/v/Manuals/333...nstruction.pdf
You could just jiggle the parameters so you end up with a custom field 11 degrees by 8 degrees. It's a huge field of view.