tried collimation mask

Did not set up the camera for collimation.

Tested with the new Duncan collimation mask on the Celestron 8" SCT. Used the Tele Vue 9mm with the Celestron doubler which yields 444 power. It looked good. I could see the curved arcs. Near focus they suddenly flipped to resemble a three-pointed star. I did not notice pronounced asymmetry. Maybe off a tiny bit. Hard to tell. Overall, it looked pretty good.

Maybe the collimation is OK, in fact. I considered doing some traditional checks.