Figuring a 16 inch flat to where it's not going to affect the DPAC is no easy task. IMHO it would be easier to find a location where you could test vertically and use the immersion null although that over 12 feet high.
Great video and setup. I have just the stairway needed. Thermals might be an issue....
I was at the Stewart Mirror Lab back in the 90's and saw a couple of 6 meter mirrors being tested...they were set up vertical also...didn't see any water in them...8^)
Edited by ccaissie, 09 November 2019 - 06:01 AM.