Search found 3 matches

by kohamher1
Wed Feb 28, 2018 11:42 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Positive Meniscus Lens for Spectrohelioscope
Replies: 2
Views: 1945

Positive Meniscus Lens for Spectrohelioscope

Can anybody please advise where I might find a positive meniscus lens for a spectrohelioscope.
by kohamher1
Wed Sep 14, 2016 12:57 am
Forum: Solar Scope Modifications
Topic: Concept model of new 12" Solar Newton
Replies: 51
Views: 14905

Re: Concept model of new 12" Solar Newton

Great job!!! A few years ago I read David Groski's article and followed his instructions to desilver both the primary and secondary mirror on my 8" Newt. I've never been able to bring it to focus. I think I'm getting a ghost image from the back side of one or both the mirrors. Question. Anyone else ...