Jerry. Great information - Thanks. I was going to mount the mask on the end of a dew shield but splitting the mask is a great idea. As you suggest, I'll need to make it fit precisely. Thanks again.
-------------------- Bill Richards
Celestron C11
William Optics ZS-105, ZS-80ST
Hyperstar 3
Canon/Hutech 350D
CCD Labs Qguide
Tak EM-200 Temma II