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.
Wild Things Photography Home