Re: ATM Perforation size for cassegrain and cassegrain baffling

["Bob May" <bobmay@nethere.com>]

You're going down the right trail.  If you want to use 2" EPs, you are going
to have to have a hole in the primary that is larger than that 51mm just to
get the light through.  I would probably do the size hole you stated if your
tubing is that size.  Even more so, I'd use 320 or 600 grit to do the
perforation with extra tubing of the size you are planning on and get the
several thou of clearance that you will be desiring.
Good luck and congrats on doing something other than another Newt.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net