Difference between US aperture stops and regular aperture stops

[spoolman]

I was recently told by the person repairing my Kodak #8 Premo plate camera that the aperture stops are US format and the crossover with regular f-stops is f16.Can anyone explain what the difference is between US stops and f stops?

Thanks

Doug

[Steve Smith]

If I remember correctly:

US - 'Normal'

16 - 16
8 - 11
4 - 8
2 - 5.6
1 - 4

I have a Wray enlarging lens with the 1, 2, 4, 8, 16 markings.

Steve.

[Sirius Glass]

Thanks, I always wondered how the US system and the standard aperture system compared.

Steve

[spoolman]

Thanks for the information, Steve.It will help a lot

Doug