UO Ortho- unusual marking

Started by khking, 09/17/2004 04:36PM

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Posted 09/17/2004 04:36PM Opening Post

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Join Date: Jan 2003

Location: Austin TX, US

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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.

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Posted 09/17/2004 07:41PM #1

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Join Date: Jul 2001

Location: Chesterfield VA, US

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Kurt,

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.

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