I have three EP's that we think came from Edmund. They are marked as follows. 1/2"FL. 1/4"FL. And 1"FL. I would like to convert them to a metric unit "IE MM". They work very well with my long focal length reflector.
What are these ?
Started by imgary, 10/07/2002 06:43PM
Posted 10/07/2002 06:43PM
Opening Post
