Sigma sd Quattro, Руководство пользователя

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FOCUSING
Adjustment of autofocus and manual focus operation are explained below.
HOW TO USE AUTOFOCUS
1
Set the focus mode switch of the lens to
AF.
2
Position the photographic subject within
the center of the composition and press
the shutter button “half-way”.

If autofocus is selected, the focusing
frame will be illuminated in green. (In the
sub-monitor, the focus indicator turns
on.)

If autofocus cannot set correctly, the focusing frame will blink. (In the
sub-monitor, the focus indicator blinks.)
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 a 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 at high speed
In such cases, please use one of the following focusing methods.
1. Use the Focus Lock function to focus on another subject, which has a
similar focusing distance as your subject.
2. Set the lens to MF mode and focus manually.