Search found 1 match

by Rusted
Sat Jul 07, 2018 6:49 am
Forum: Solar Scope Modifications
Topic: Front ERF vs Internal ERF? Minimum size?
Replies: 27
Views: 1177

Re: Front ERF vs Internal ERF? Minimum size?

This is a bit late but I have a warning about sub-aperture, internal D-ERFs: There is a fiercely hot, refocused and unfiltered , reflected Solar image well in front of my 6" f/8 [120/10] objective. I'm using a 90mm internal Baader D-ERF with PST H-a filtration in an old CR150HD donor. Fortunately, m...