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PLEASE NOTE: SIRIUS FILTERS ARE NOT A-R COATED AND REQUIRE INFREQUENT AND VERY CAREFUL CLEANING.this is a filter from the 16 years defunct Sirius OpticsIt is an early Lumicon H-betta Line Filter. Very narrow transition chanel 486 nm 93% this filter is for the horse head nebula in Orion not very useful  for any other nebula. and you need a 10 inch or larger aperture to use this filter.

Filed under: Eyepieces & Accessories