Tropel Lambda λ/4 Plate Quarter Wave Mica 436nm Large 85mm Window, 120mm O.D.
Made by Tropel Division of CGA CorporationExcellent condition, no marks of window, see photos436nm 1/4 waveplate Aperture is about 85mm, with a few mm hidden behind the retaining ringOverall diameter is 125mmMount thickness is 19.5mm
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