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What ND for herschel wedge


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hello

I actually use an home made herschel wedge . 3 filter are mount with the prism : nd3 , UV/IR cut  and variable polarising . 

I would like to remove the both polarising  to use just one ND filter .

What density do you think will be the best compromise  ? The three filter will stay mount in the diagonal herschel wedge ( I want to avoid screwing / unscrewing filter at each eyepiece change )

thank you

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