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I have a Quark, Prom model. I use it with an ED80. It suits my needs just fine. It shows an extraordinary amount of faint detail in proms. It does also show filaments, but of course not as easily as a dedicated H-alpha instrument. But more detail in the proms than a dedicated H-alpha? Dunno. It depends on how deep your pockets are too, not just expectations. In my own situation I cannot justify a dedicated H-alpha instrument in my collection. The Quark gives me the prom display that I want and allows me to use the ED80 for other purposes.
I have used single and double stacked H-alpha scopes. These are also less tricky to use than a refractor with a Quark. There are several "tricks" I use to pull as much detail from the Quark, but this also means that the Quark is flexible in how it can be used, not just stick an EP in it and that's it. A Quark and an H-alpha scope are different beasts. I can also use the Quark with a 4" scope, and a 4" H-alpha scope is a wee bit more expensive... It all depends.
My sketches below were all done with the Quark and ED80. I've also put down the sunspots and whatever other chromosphere details that were visible, such as plages and filaments.
This Quark/ED80 combo has also shown me filaments that transition to across to proms. Took me by surprise the apparition, but there it was. It is a good tool the Quark.
Alex.
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