There are a few things that have to swing in your favor if you want to get a crisp image of the Moon.
The telescope has to be perfectly collimated.
The seeing has to be superb.
This is the bright double star Castor, Alpha Gemini, magnitude 1.6 and 3.0, separation 5.2 arc ".
The Airy disc of each star was steady and obvious visually at about 200X, so I decided to give this close double star a go, and see if I could show the diffraction rings around each star in an image. To my great surprise, it worked out pretty well.
I did virtually no processing on this image other than to crop it quite a lot.
BEWARE !!! Anyone who attempts to replicate this image with mediocre optics and average seeing is setting themselves up for considerable heartache.
Having said all of that, I encourage our forum members to try this experiment for themselves. It will certainly tell a great deal about your optics, and also about your local seeing conditions. GLTA
89mm f/14.6 Maksutov-Cassegrain telescope, 12mm Brandon eyepiece, 2X internal Barlow lens, iPhone SE camera, NightCap Camera app, 1/25th second exposure, ISO 100, 20 individual images stacked with Nebulosity 4. Processed with Apple Photos.
Read about Airy disc here :
Edited by LorenBall, 12 May 2019 - 01:33 PM.