James s Posted August 25, 2015 Share Posted August 25, 2015 When i got a second hand refractor it came with some filters one of them has no writing on it when you look through it,it shows blue but on the other side it is reflective gold i have no idea what it is and what it is used for sorry for a daft question but can someone let me know what it is for Link to comment Share on other sites More sharing options...
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