Hi Leigh,
I found it... "Key Shutter Speed," discussed in Newsletter #24.
The f/stop is: f/22.
Then you find the key shutter speed. Now never go over it and you will never use too fast a shutter speed (so the hare-brain logic goes).
Now I don't mean to sound critical of him, I enjoy reading his works and asking myself "is he right or is he wrong?" Can't do that with Donald Knuth or Ansel Adams.
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