• Small apertures for expansive detail. Aperture between f/16 and f/32 keep everything from near to far in sharp focus. These small apertures are ideal for landscapes or travel scenes when your goal is to show as much detail as possible.

• Middle-range apertures for “safe” subjects. When depth of field really isn’t much of a concern, the apertures between f/8 and f/11. These apertures are neither expansive nor limiting in the depth of field the proved, but they are quite useful for images where the main subject and the background are at relatively the same distance.

• Large apertures for extracting subjects. The apertures between f/1.4 and about f/5.6 can be used to render everything but your subject out of focus.
Adapted from Exposure by Jeff Wignall (PhotoWorkshop, 2007; $30)_