f/stops

This is the standard sequence of f/stops from f/1.4 to f/22. Although it doesn't seem intuitive at first, in this sequence the f/1.4 setting lets in the most light while the f/22 setting lets in the least. Also, each of these f/stops has precisely the same halving/doubling relationship as the shutter speed sequence.

1.4 2.0 2.8 4 5.6 8 11 16 22

Shutter Speeds8 seconds 4 seconds 2 seconds 1 second 1/2 second 1/4 1/8 1/15 1/30 1/60 1/125 1/250 1/500 1/1000

Each of these settings is clearly half/double the length of time of its immediate neighbours (OK, I know, 1/15 isn't exactly half the time of 1/8th and 1/125th isn't half the time of 1/60th, but it's close). This doubling/halving is thus pretty simple to comprehend for this exposure setting.