Olympus AZ-4 Zoom - Manual (Page 43)

• Over 100mm In the full-zooming position, you will be using, in effect, a 135mm lens which will
give you a field nearly 4 times as narrow as what you would have with the lens in the 35mm
position. You can appreciate the excellence of a true, telephoto lens. Compared to wide-angle
photography, you have a narrow field of vision and the depth of field to be photographed is fairly
shallow.
Also, since your pictures will have less depth of field than with the lens in the wide-angle position,
you will be able to take pictures in which you enjoy having only the subject in true focus. Aim your
camera for close-up shots of sporting events or for animal subjects in their natural habitat. It is
possible to achieve close-ups unnoticed of people in crowds. These kinds of snapshots and portraits
with only the subject in focus can be quite enjoyable. Caution is necessary, when you are taking
shots with the lens in the telephoto position, to hold the camera steadily so that you can avoid any
unnecessary shaking.
* The three examples on the left are samples of the same subject photographed with the zoom lens
set at three different positions. It is easy to comprehend the effects of zooming up. The three
samples on the right of the same subject photographed with the zoom lens set at three different
positions, but the size of the subject remains the same. It is easy to comprehend the relationship of
the subject to the background in these different settings.
Total area of overall image sharpness within the angle of view of a specific focal length setting.
Depth of Field will be at its greatest when the lens is in its lowest focal length positions.
42
35mm 70mm 135mm