Baader - D-ERF Energy Rejection Filter 110mm with IR-Cut Dielectric Coating

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Baader Planetarium D-ERF Energy Rejection Filter, 110mm with IR-Cut Dielectric CoatingBaader planetarium has introduced a new evolution in their premium energy rejection filters, from 70mm up to 180mm! The Baader D-ERF filters incorporate a new all-dielectric IR rejection coating that eliminates the heating from IR energy to produce a truly cold focus (hence, "Cool ERF").

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