Thread: Reducing the length of my 18inch dobsonian?
View Single Post
  #14  
Old 10-11-2017, 01:02 PM
raymo
Registered User

raymo is offline 		 
Join Date: Sep 2011
Location: margaret river, western australia
Posts: 6,070
The periscope advert states that it works with optics of f/8 or longer.
raymo
Reply With Quote