Thread: SCT/Newt/central obstruction debate [split from 16" Dob]
View Single Post
  #14  
Old 13-10-2006, 12:16 PM
Starkler's Avatar
Starkler (Geoff)
4000 post club member

Starkler is offline 		 
Join Date: Sep 2004
Location: Melbourne
Posts: 4,900
Quote:
Originally Posted by CoombellKid
how did you come to 20%
Sorry I divided the wrong way. A two inch secondary is 1/5 the diameter of a 10 inch primary, hence 20%.
Reply With Quote