ATM 3 or 4 vane Spider

["Art Russell" <artrussell@mindspring.com>]

I'm contemplating ordering either a 3 or 4 vane spider for a 6 inch, F4
Newtonian for which I'm currently polishing the mirror.

Any comments about the current thinking about the best way to minimize
difraction spikes? 4 vanes seem to be self reinforcing whereas 3 spikes seem
to create phantom spikes. If anything else new is noted in the FAQ, I've
missed it.

Thanks and Cheers!

Art Russell

Atlanta, Georgia

mailto:artrussell@mindspring.com
http://Education.gsu.edu/spehar/

What are the facts? Again and again and again - what are the facts? Shun
wishful thinking, ignore divine revelation, forget what "the stars
foretell," avoid opinion, care not what the neighbors think, never mind the
unguessable "verdict of history" - what are the facts, and to how many
decimal places? You pilot always into an unknowable future; facts are your
single clue. Get the facts!

- Robert A. Heinlein, from "The Notebooks of Lazarus Long"