Minolta DIMAGE VIEWER 2.1 Instruction Manual download pdf (Page 82)

82 A SHORT GUIDE TO PHOTOGRAPHY / USB-TRANSFER MODE

The lens aperture controls not only exposure, but also

depth of field; the area between the closest object in

focus and the furthest object in focus. The larger the

aperture value, the greater the depth of field and the

longer the shutter speed needed to make the exposure.

The smaller the aperture value, the shallower the depth of

field and the faster the shutter speed needed to make the

exposure. Usually landscape photographs use a large

depth of field (large aperture value) to keep the

foreground and background in focus, and portraits use a

shallow depth of field (small aperture value) to separate

the subject from the background.

Depth of field also changes with focal length. The shorter

the focal length, the greater the depth of field; the longer

the focal length, the shallower the depth of field. Wide-

angle lenses also create a strong perspective which gives

a sense of depth in the image. Telephoto lenses

compress the space between the subject and

background and create a weak perspective.

The shutter controls not only exposure, but also the ability

to stop motion. Fast shutter speeds are used in sport

photography to stop action. Slow shutter speeds can be

used to show the flow of motion such as water cascading

over a waterfall. The use of a tripod is recommended with

slow shutter speeds.

A SHORT GUIDE TO PHOTOGRAPHY

Ev stands for exposure value. A change of

one Ev adjusts the exposure by a factor of

two.

WHAT IS AN EV?

+2.0 Ev 4X as much light

+1.0 Ev

–1.0 Ev

–2.0 Ev

2X as much light

1/2 as much light

1/4 as much light

Calculated exposure

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 103 104

No comments

Minolta DIMAGE VIEWER 2.1 Instruction Manual Page 82