I have the 387/11 and use it in my CaK filter (and also thor coated KG3!). That slope definitely has a positive effect in terms of image contrast.
I think the one to add would be one of the andover 1nm 393nm filters https://www.andovercorp.com/products/su ... s-filters/
Calcium k-line emitter system / UV-ERF-70% \ off the shelf
- marktownley
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Re: Calcium k-line blocking filter / ERF - quest off the she
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