CORONADO PST -- 40mm Hydrogen Alpha Solar Scope

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Minus Violet Filter (Orion V-Block)

Does an excellent job of removing most of the violet fringe on a fast achromat scope.  Leaves a little fringing, but nothing very objectionable.  Does give a greenish tint to most objects.

Solar Filter (Baeder)

Great stuff, currently available only in loose sheets from Astro-Physics, roll your own cell. Most natural color (my eye sees it as a white-yellow, yet most pictures have a definite blue tint) and highest detail level of any basic solar filter I have tried.

Solar Filter (Orion)

Standard glass filter.  Multiple metals are plated on back of a piece of optical glass.  Many have small pinholes and/or scratches, a dab of black paint fixes them right up.  My filter has no flaws that I have found.  Orion uses a nicely machined aluminum cell lined with foam tape.  The newer models also have three nylon setscrews to provide additional security.  The one I have fits my ETX-90 and ST-80.  The ST-80 is handy, but the ETX, with a little more than three times the native magnification, shows much better detail. 

Light Pollution Filter, Narrowband (Meade)

Some benefit on some items. Generally we don’t see much improvement, but then we do try to get out where it’s dark to start with…guess if you stay in town it may be of more use

Oxygen III (Lumicon)

Definite must-have filter. Makes several nebulas jump out, especially the Veil Nebula. Greatly reduces white light levels so images in small scopes are extremely dark, stay with the bigger scopes for the best image.

Hydrogen Beta (Lumicon)

Have not had enough use to determine if this is a must have, or a not to have.  Difficult to use.

Neutral Density 96% (Celestron)

Another definite must-have. This one blocks 96% of all light, they are available in levels between 80 and 98%. Often referred to as a “Moon Filter”, though some of those also have green filtration added. Knocks the light level down to a more comfortable level when viewing the Moon and Jupiter.

Variable Polarizer

Actually just two common polarizer's threaded together.  Kind of  a kludge, but does work fairly well.  Once I decide how much filtration I want, a piece of tape on the rings keeps the adjustment in one place.  Generally run it at maximum interference for taking pictures of the planets.

Color Filters – Red, Green, Yellow, Blue

Try different filters and combinations of filters on the Moon and planets. Different colors will show different details. There are no hard rules as to which works best for what, find what works tonight and your results will be totally different next week.

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