Focusing, How to use autofocus – SIGMA SD9 User Manual
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Adjustment of autofocus and manual focus operation are explained below.
HOW TO USE AUTOFOCUS
It is possible to use Autofocus function only with AF Lenses. Your camera is
equipped with highly precise AF System and incorporates two different
autofocus modes.(In the case of Mirror lenses and some specialized lenses,
the camera can be use only in Manual Focus mode).
SETTING THE AUTOFOCUS MODE
1
Set the focus mode switch of the lens, to AF.
2
Press the shutter button “Half-way” and check
the sharpness of the subject on the focusing
screen.
This camera will inform you with an Electronic
Sound, to confirm correct focus in Single AF
Mode.
Although your camera is equipped with highly precise AF system, in
some cases autofocus cannot set correctly.
Low-contrast subjects, such as blue sky or blank wall, etc. or when the color of the
subject is same as background.
The subject is located in a very low light environment
Overlapping near and far objects, such as an animal behind a fence
A subject, which moves with a high speed
Subjects, which have repeated patterns such as building windows.
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