|Aperture - The f-stop, or the size of the shutter opening.
|Depth of Field - The zone of sharp focus within the image.
|F-stop - Same as aperture.
|Hyperfocal Distance - The distance at which anything that is between
1/2 that distance from the lense and on out to infinity will be in focus.
This optimal distance is a calculation based on the focal length of the
lense and the aperture used.