Focusing, How to use autofocus – SIGMA SD1 User Manual
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FOCUSING
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
Decide the composition through the
viewfinder and press the shutter button
halfway (if the autofocusing is selected, the
camera confirms focusing with an electronic
sound and a red “in-focus” indicator appears
in the viewfinder).
Although your camera is equipped with highly precise AF system, in
some cases autofocus cannot set correctly.
z
Low-contrast subjects, such as blue sky or blank wall, etc. or when the color of
the subject is same as background.
z
The subject is located in a very low light environment.
z
Overlapping near and far objects, such as an animal behind a fence.
z
A subject, which moves with a high speed.
z
Subjects, which have repeated patterns such as building windows.