J.M.B. Solar Filter "A" for Celestron C90 Rubberized
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Color band - blue. Class "A:' filters are made with the same premium quality polished glass and multi-alloy coating as Class "B." An additional steel alloy added to the coating process makes our Class "A:' filters extremely scratch and fade resistant. Excellent for visual and photographic use. Light transmission is 1 /1 000th of 1 Neutral density - 5.