Jeff,
CaK is a completely different view of the Sun...
The flocculation, plage and sunspots, fibrils are are seen at a different height from Ha. Slightly lower than in the core of the Ha.
The resolution (theoretical) is much higher than Ha (636/380 = x1.7) but the seeing is equally worse!
Unfortunately Coronado no longer produce their CaK filters...only Lunt left in the game unless you DIY.....
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