[OM] 500mm relfex lens question

[WJDuprey]

Another beginner question.  What is this reflex mirror lens? And what is the 
term Catatrioptic mean?  I know I've misspelled a lot here but the wife wants 
to take her nightly walk and ice cream stop so I gotta be fast...

Thanks for the information

William Duprey
Ann Arbor, MI

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