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ISO and F-Stops

  • From: "J. Wayde Allen 303-497-5871" <allen@xxxxxxxxxxxxxxxx>
  • Subject: ISO and F-Stops
  • Date: Mon, 16 Sep 1996 09:09:09 -0600 (MDT)
On Sat, 14 Sep 1996, George L Smyth wrote:

> No, one stop will double or halve the EI.  For instance, if you are set
> at EI100 and open up one stop, you are now set for EI50.  Conversely,
> stop down one stop and you're set for EI200.

I just took a look at the film speed dial on my camera camera (Pentax 
K-1000), and the settings go:  100, 125, 150, 200.  It looks like you are 
correct.  Evidently I was thinking in terms of the number of steps between 
the settings.

- Wayde
  (allen@xxxxxxxxxxxxxxxx)


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Topic No. 3