Martin, thanks for the notice.
I used the color version of the IMX178, thus I don't think the "normal" rules apply for critical sampling. With the Bayer matrix I figure you need about 1.5X more scale to sample correctly. Thus, 12 x 1.5 is f/18 which is what I was trying to get.
As for the seeing, it was only about average (meaning not good, not particularly bad). However, this time of the year the early crescent moon is just about as high in the sky as it gets so that helps with these shots. Actually, the seeing when I took my shots using the C90 was actually a lot better...
Edited by james7ca, 04 March 2017 - 10:00 AM.