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There are two of grades of Baader film - density 5 and density 3.8 which is recommended for photographic only. You haven't got the latter by mistake?!?
Actually, it's been recommended to use the photographic film for the early part of the Mercury transit as it will be so low down and correspondingly dim.
I've only used the density 5 film on a 5" f15 and found it far from bright.
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