Minolta X-700 User Manual download pdf (Page 44)

DEPTH OF FIELD

The range behind and in front of the focused

distance within which the image appears accepta-

bly sharp is called the depth of field.

It extends a greater distance behind the focused

distance (usually about 1/3 in front, 2/3 behind)

and is determined by three factors: the aperture,

the distance at which the lens is focused, and the

focal length of the lens. As illustrated by shaded

trees above, depth of field increases as the lens is

stopped down (e.g., f/1.7 to f/22) and becomes

greater the farther from the camera the lens is

focused. It decreases as the lens is opened up (e.g.,

f/22 to f/1.7) and the closer the lens is focused.

Depth of field is greater for short-focal-length

lenses than for telephotos at the same focused

distance and aperture. It is at its least for any given

lens in normal mounting when the lens is at

maximum aperture (as when metering and focusing

normally with Minolta MD or MC lenses) and at

minimum focusing distance.

focused distance

FOCAL LENGTH

Focused distance

FOCUSED DISTANCE

Focused distance

APERTURE

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Minolta X-700 User Manual Page 44