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Thanks!,
Imaging in the light of CaK (3934A) actually shows the solar chromosphere at a different height from H alpha.
The H alpha (6563A) is visible from the photospheric surface (the "white light surface") up to around 1500Km - this shows the sunspots, plage, filaments, spicules and surrounding surface of hydrogen mottles.
At the Cak level >1500Km the image is dominated by the hydrogen flocculi - larger network of "supergranulation cells" with brighter flocculi areas around active regions. In CaK the sunspots are still visible as well as some filament type structure.....
I'm quite pleased with the outcome from the Omega filter stack - little or no vignetting, no major signs of ghosting and a bandwidth which looks similar to that achieved with the commercial Lunt CaK module.
Better seeing would help!!!
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