As my basement is too cold to polish anything, I have resumed another old project, My 12.5" f/6 telescope with a pre-generated curve. I just completed grinding with 320 Silicon Oxide. I have 500 SiO as well as 25 micron AlO, any suggestions as to which I should use next? Thanks. Francis J. O'Reilly _______________________________________________ ATM mailing list http://www.atmlist.net/