Nice work. Have you used the Maksutov 127 for the close up work with either a 2x or 3x Barlow; with the Moon being so bright and light not being a limiting factor, you may find the contrast is better (or not, but this is where experimentation is important). A 2x Barlow with the 127 would give you a focal ratio of 24, and using the 3x Barlow f/35 (which may just be too much). But would be worth experimenting. Are you using the 600D in video mode or taking a thousand stills? The video mode of the DSLR, as I'm sure you know, results in some compression, so you may find 10-50 still frames result in a tidier stacked image than 20 frames from a video. Great stuff though - keep up the good work.

Many thanks James. I did indeed use a 3x Barlow. I used the 'Planetary' feature of Backyard EOS which takes frames from the camera's live view screen and saves them as jpg frames, assembling them automatically into an avi file. As you rightly say the 3x Barlow is a bit much and I'm interested in comments on the software developer's site that recommend using the 5x zoom feature which gives a 1:1 resolution. If I understand correctly, this give the best quality possible while retaining the advantage of a higher frame-rate to seek out the best moments of seeing. When I get chance I shall do a comparison between 2x Barlow, 5x zoom and 10 to 20 full resolution stills to see what I get. Thanks again.