Quote:
Originally Posted by bigjoe
Astronomik CLS another ; use it ahead of my Blue 80 A..Great for cutting out light pollution problems when doing AP too.
Bigjoe
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Hi Joe,
Yes that's a "BroadBand" Light Pollution Filter. It doesn't need to be that one specifically, they all work very well as "Planetary Filters", notwithstanding they might not work as well as each other for their designed light pollution reduction purpose.
These work well as "Planetary Filters" because they reduce "Irradiation" which is the distortion of the Boundaries between light and darker features and they soften the tones of similar adjacent colours. Both of which helps to improve the "signal to noise ratio"
Cheers,
John B