At 10:23 PM 29/08/01 -0400, you wrote: > He said that if the laser and lens were placed 150 feet from my >6 inch f/7 mirror I could check the mirror's figure by "star testing" using >the illustrations in Dick Suiter's book. Does anyone know where I can find >additional details on this method. > >Les Yes in Dick Suiters book. Page 88