Piece of blue glass on a string?

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athanasius80

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I was just going through an old LF setup I bought off of e_ay and found a piece of deep blue glass not quite 2" in diamater hanging from a string. Its just a piece of glass. I've stumbled across these before and I'm wondering if people used these for metering before modern light meters.
Any ideas?
Thanks!
 

David A. Goldfarb

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That's probably a monochrome viewing filter. Zone VI sold one. The idea is that you can look through the filter to get a better idea of the tonal relationships that B&W film sees.

P.S.--it's okay to say "eBay" here.
 

glbeas

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Actually they are used for helping to visualise the scene in B&W. This works to show it like blue sensitive film will see it
 
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