Quote:
Originally Posted by Merlin66
To do this, a Fabry-Perot interference filter (etalon) is usually used in conjunction with a blocking filter.
The F-P etalon produces a series of bands about 0.1nm wide and about 0.8nm apart, these cover the whole spectrum. The particular band we want at Ha is "filtered" out by using a very narrowband Ha filter ( about 0.6nm) called the Blocking Filter ( ie it blocks out everything other than the required wavelength). So the combination of the etalon and the BF give us the resolution at Ha.
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WHAAAA?
Wow! did not think it was so complicated!
I kinda understand blocking out filters....but all the other stuff????
Need to do some Googleing!
Thanks for the extra homework!
Bartman
