Just curious. Some venders put marks in the center of their primary mirrors for collimating purposes. Is this part of the mirror not important for astral viewing due to the central obstruction or is there another reason one can do this?
Collimating Spot on Reflector Primary
Started by mte1955, 03/27/2008 02:39AM
Posted 03/27/2008 02:39AM
Opening Post
Funding Member
