J.M.B. Solar Filter "A" for 11" Schmidt-Cassegrain telescopes

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.