What Ray said
Actually, I just last night dithered..?..without dithering.
Like most, without guiding I get slow drift due to polar missalignment and tube/mount flexure etc so because I was doing lots of very short subs I didn't bother getting the software to move the scope between subs ala my normal dithering (this would have added too much time as I was trying to image through breaks in the clouds
) I just let the dozens of quick subs come down and over time the slow drift created enough shift between subs (with out elongating stars) so that when I median combined - bingo noise gone
Got
THIS image which proves you
can image when it is cloudy
Mike