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Old US F-stop System

 
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camz



Joined: 15 Apr 2004
Posts: 138
Location: Southern CA
PostPosted: Fri Dec 23, 2005 6:05 am    Post subject: Reply with quote
I am looking for a conversion table for the
old US f-stops.
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Les



Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI
PostPosted: Fri Dec 23, 2005 12:37 pm    Post subject: Reply with quote
There is a mathmatical formula but it's a whole lot easier to remember that F16 and US 16 are the same. Write the us scale. 1 2 4 8 16 32 64 128 256

Then start and 16 and work toward both ends

16 22 32 45 64
4 5.6 8 11 16
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