Quote:
Originally Posted by PCH
Hey guys, - anyone care to share what "double stack" means por favor.
Thanks  |
In this case there is separate Ha filter that simply screws on to the front of the scope. It is the 50mm filter that you can buy as a separate item to use with a blocking filter to convert an ordinary refractor into a solar scope.
It produces a dimmer image due to the combination of more filtering and smaller aperture, but surface details just come screaming out of the eyepiece.
Malcolm