Thanks for all the thanks, folks ! As for the wallpaper idea, considering the results I'm keen on making a proper photo-setup for this telescope+N900 combo, so I could use stacking and timed exposures... That would produce images of sufficient resolution to use them as wallpapers.

PS. Hey, who voted this thread with one-star ? I know the title is a bit misleading but the contents can't be THAT bad, right ?