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Lee and for anyone else.
Double stacked- a solar scope can be either a single stack which is around 0.7A (Angstrom). This shows detail on the surface and prominences. The detail on the surface is hard to see when you first look in but it becomes more visible as your eyes adjust to the light. If you add another module called a double stacking module this give you a more contrasted look and the view is around 0.5A. There is slight more detail visible but the surface detail is more prominent and makes for really nice viewing. It is not absolutely necessary for imaging.
Pressure tuning - is the way Lunt scopes tune the etalon to see the Ha detail. It has a really large knurled knob which you turn one way or the other and that increases the pressure in the tuning vessel.
Etalon - is the device that gets tuned to 656.28 nanometers.
Blocking filter - is a necessary component to stop the damaging radiation and is usually found after the etalon in a diagonal (made by the solar scope company; it is not a normal diagonal).
You can buy several scopes for that price range. I recommend a 60mm Lunt with double stacking for that price range. Bintel has prices listed on their site.
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