Thread: FS: 355mm Dobsonian Mirror (Never used) - PERTH ***PICS UP!
View Single Post
  #2  
Old 30-12-2008, 01:42 PM
Ian Robinson
Registered User

Ian Robinson is offline 		 
Join Date: Jan 2007
Location: Gateshead
Posts: 2,205
What f number ?
How thick ?
Substrate ?
What is the coating (std Al , protected Al, enhanced Al) ?