Printed on the Inside of a Box of Kodak Plus-X pan, ASA 125:

Set your camera or meter to ASA 125 (if it has a meter) and shutter speed to 1/125 second.

Bright or hazy sun on light sand or snow f/16

Bright or hazy sun (distinct shadows) f/11—use f/5.6 for backlit close-up subjects

Weak, hazy sun (soft shadows) f/8

Cloudy bright (no shadows) f/5.6

Heavy overcast/open shade f/4—subject shaded from the sun but lighted by a large area of clear sky