Quote:
Originally Posted by AstroGuy
.. Particularly when programmed to bandpass good detectable energy levels of the Calcium K Line and Hydrogen Alpha wavelengths of the visible light spectrum?
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No, you can't program the LCD filter to pass only one spectral line, being it a Calcium or Hydrogen or whatever else..
For something like that you have to have very narrow band filters (0.7 Angstroms or narrower) - they are on the market of course (they are not even that much expensive, definitely within the financial reach of many amateurs).
And they are "programmable" or , the better expression would be "tunable". This is achieved by changing the temperature of the filter assembly bu couple of degrees Celsius (it is actually the sandwich made of many individual interferometric filters).
Examples are here:
http://www.solarscope.co.uk/
http://www.meade.com/product_pages/c...o/coronado.php