23 Sep
2006
23 Sep
'06
8:21 a.m.
Also, what do you think about a simple focusing aid where three holes in a cardboard mask are used to make the star images converge? I forget the name of this device but I made one and it seems to work well. Thanks, Joe Hey Joe (sounds like a tune somehow),
Fran and I visited Mt. Palomar back in January. The old Hartmann mask for the 200" was still leaning against the wall. The thing must have had 30 holes in it. It's not used any longer, but I guess the city won't pick it up with the trash. Michael