Nice, I look forward to hearing your report Ron. My scalable drawing was originally designed for my 12" scope so that is the reason for more lines I think. I was lazy and didn't want to make a new mask for every possible focal length and aperture. That’s why I am very grateful to David for his generator!

Joe - I am going to hunt you down at Okie-Tex so I can see how that mask works on your Dob... OK - what I really mean to say is I want to look through your Dob please.

Cheers!