Theres been a couple posted here so far so thought i would add mine to the collection . Can't remember how many i stacked but over 10 for sure . Taken PF my C8 SCT @ 1600 ISO , f/10 for 25-secs . Stacked in Registax and PP in PS7 . BTW if you look at the center with adverted vision you can slightly see the Nucleus off center to the left . It's more obvious in more closeup images .