Re: Calcium k-line blocking filter / ERF - quest off the she
Posted: Tue Apr 05, 2016 8:16 am
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/
I think the one to add would be one of the andover 1nm 393nm filters https://www.andovercorp.com/products/su ... s-filters/