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/
Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
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