29 Jun
2005
29 Jun
'05
5:50 p.m.
Kim You probably can find some DIY info http://www.cloudynights.com/howtos2/hartman/hartman.htm http://www.google.com/search?biw=769&hl=en&ie=ISO-8859-1&q=Hartmann+mask) on line. Almost any size (w/i reason) hole works spaced 120 apart. Small holes for bright objects, somewhat larger holes for dim objects. I do believe there are some Hartmann masks commercially available also Have fun Rob