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View Full Version here: : Filters ???????

Paduan
18-06-2011, 10:15 PM
Why are there so many different coloured filters what are the regular ones? why are there so many shades of red green & blue?
Merlin66
18-06-2011, 10:24 PM
http://www.lumicon.com/astronomy-accessories.php?cid=1

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