I see the rotatble polarizer at the bottom of the condenser. The filter that is inserted by the silver lever maybe is a lambda plate (to tint the background or maybe a quater wave plate). I think you only need a fixed analyzer like the one that Mitch has (Mitch says that he knows how is selling two units) and you are complete to test the Biophot with DIC.
Rogelio
biophot dic
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