My STC Duo is the 2” version not the clip in. I bought that one because I knew at some stage ( hopefully very soon ) I’ll be moving to a OSC astro camera. As far as refractors go, I have a 100 mm one but I very rarely use it and haven’t tried it. Casstony in the tread below is your goto man there. I forgot to mention him in my previous thread ( sorry Tony ) but he is another accomplished imager with these filters.
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