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I have no way of testing reciprocity without spending a lot of money on ND filters, so I am doing it by trial an error, I took a shoot that needed an exposure of 29 minutes according to the reciprocity group C7, well it is a bit underexposed, I would say about 2/3 of a stop. Which group should I try next, C8 or D7? Or if you have a better suggestion by all means let me know.. 
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