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That’s very interesting Ken. I’m doing something similar. I got Meade ETX 105 that I don’t use and I’m trying to convert it for solar imagining. I have ordered 4” optical flat and 4” red Aerial Camera filter. I’m going to stick silver window tint foil on optical flat and then mount red filter behind it. That (hopefully) will work as ERF. I can not find much information on solar tint foil properties but as it reject mostly heat I hope it will pass light up to 700nm. I that is going to work then I’m going to order 656.3nm filter that I found on eBay for about $80. If sometimes in the future I find cheep (keep dreaming) PST for parts then I would use etalon from it. I been told it will not work but until I try I wont know for sure
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