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Fooling exposure with ISO dial (was: FED)

  • From: P3D Dr. George A. Themelis <fj834@xxxxxxxxxxxxxxxxxxxxx>
  • Subject: Fooling exposure with ISO dial (was: FED)
  • Date: Thu, 20 Mar 1997 15:14:26 -0500 (EST)
>Look at it this way - the proper exposure for a sunny day and a midtoned
>subject for ISO 100 film is 1/100 @ f/16. If you set your FED dial at
>ISO 100, it is way (say 2 stops) underexposed. That means the FED is 
>-really- choosing something like 1/200 @ f/32 (for example). By changing
>the dial (in this example) to ASA 400, you can force the camera to
>use the correct exposure for the scene.

I think you should change the dial to ISO 25 in this case, not ISO 400.
Slower speed film needs more light, thus correcting underexposure.

-- George


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