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Bobsprit wrote: Ones filters really cool a Nebula Line Transmission% Oxygen-III 496mm90 Oxygen-III 501 nm85 H-beta 486nm88 I wish I could afford a pair of sunglasses made out of this stuff. The ulta high contrast will blow your mind. Have any ideal what its for? Some are for cutting out ambient man-made light of varrying types. Some work well for photography, others visually. But remember that they also cut ALL light by as much as 4 or 5%. 4 or 5% is bugger all. Better to find a dark sky. Always. Cheers |