There is another way to get rid of hot pixels if you didnt take a dark frame, but ist time consuming -simply use the clone stamp tool in Photoshop and stamp out all the hot pixels..you do seem to have a few though
(dark frame is one or better a median stack of an odd number of images with essentially the camera lid on)
BTW why not try prime focus photography instead of eyepiece projection-prime focus is easier.You wont need the holder gizmo then
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