Before we used digital cameras, we had to figure out exposure using light meters that weren’t very accurate, cameras that varied in their results, and chemicals that we had to keep at specific temperatures. Few photographers paid enough attention to the details. Fred Picker did.

Over the years he wrote a quarterly newsletter that described what he thought was the ideal way to take photos…as well as advertise equipment from his Zone VI company. The one issue of the newsletter that I remember was in April 1980, Issue #24. In it he described what he called a “Key Day.” A Key Day was the ideal sunny day without clouds. According to Fred, if you knew the setting for a key day, you could figure out the proper exposure for other outdoor scenes.

For those who shoot with digital cameras, from iPhones to DSLRs, you might want to quiz yourself on how well you can predict proper exposure settings. Take a picture. Guess what you think is the correct f/stop, shutter speed, and ISO. Then cheat…and look at the digital photo’s info, like this one. How well did you do?