>  That's an f 2105,  about  14 stops larger then f16. 14 stops is 16384
> times exposure. If you needed 1 second at f 16 you would need to expose
> for about 4.5 hours at f 2105.  Hope you have a good tripod for that tube.

But if he's using 400 ASA film, that's only 40 sec as the BDE exposure,
excluding reciprocity.




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