This is by far the easiest way to focus/collimate your 8" SCT!
Simply remove the three outer plugs and focus untill all three star images converge into one! Then remove it and your ready to observe.
If you do any CCD work or 35mm, you have to have this! Like new,
$30 shipped to US only.
I accept money orders, or postal checks.
Please call or email for any questions.