[TareqPhoto (Tareq)]

Originally Posted by Merlin66

Tareq,
It's getting more and more difficult to obtain good external etalon (H alpha) filters to use (with a blocking filter) on standard telescopes.

The Daystar Quark seems to be a popular alternative.
The Lunt Cak filter is also available.
https://www.daystarfilters.com/Quark.shtml
https://luntsolarsystems.com/shop/ac...ium-k-modules/

I am talking about those Quark or Lunt filter or even something like white light to be used with standard scopes rather than dedicated solar scopes such as Lunt itself or Conorado and such.