On a clear sunny day, set the aperture to f16 and the shutter speed to the 
inverse of the film speed (e.g. 1/100 (or 1/125) for ISO 100, 1/200 (or 
1/250) for ISO 200, etc).  Of course, you can elaborate from there - f 8 
and 1/500 for ISO 100 film for example.

You probably should use print film for this, since it is more forgiving in 
exposure than slide film.

Good luck!

- MCC

At 06:45 PM 12/3/01 -0800, you wrote:
>Sorry to be a bore,
>But can someone explain the Sunny 16th rule for me, as I am not going to
>have my SPF meter repaired. I also want to use my newly acquired S1a, so I
>need to practice exposures without the aid of a meter.  I will eventually
>buy one, but not now.
>Regards
>James
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[EMAIL PROTECTED]
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Photos:
http://www.markcassino.com
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