Try here, there's a chart, but it's in meters. http://www.conent.com/ConAdv/Encyclopaedia/Photography/CNQ_CAPhotography001.asp

Also, keep in mind that with real world cameras, the F-stops affect how much light reaches the camera: as the numbers increase the image gets darker unless you either use faster film, or a slower shutter.  This is something Poser does not really address.

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