I'm so sorry! I seem to have completely missed your response. I should log in instead of just browsing the threads. :oops: I fitted my 90mm D-ERF into a stainless steel pot and then bolted it to the nearest original baffle to the correct size. https://fullerscopes.blogspot.com/2018/02/going-h-alpha-...

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...