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UO Ortho- unusual marking

Started by khking, 09/17/2004 04:36PM
Posted 09/17/2004 04:36PM Opening Post
Hello eyepiece experts, I just added the 9MM UO Ortho(non HD) to my set of 5,7,12.5,18 and 25MM's. The 9MM is the only one that has additional lettering along the top. The unusual letters are
"O.P.S.". Can someone please clarify these letters? Thanks.
Posted 09/17/2004 07:41PM #1

OPS refers to Orthoscopic Planetary Series. I don't know much about them, but they are supposed to have some kind of filter coatings on them to enhance planetary viewing.