SIGMA DP3 Quattro - Manual (Page 49)

49
FOCUSING
Adjustment of autofocus and manual focus operation are explained below.
FOCUS MODE
Each time the button is pressed, AF mode (without
an icon) and MF mode ( icon) will alternate.
HOW TO USE AUTOFOCUS
Position the photographic subject within
the centre of the composition and press
the shutter button “half-way”.

If autofocus is selected, the focusing
point will be illuminated in green. (At the
same time, the auto focus lamp will be
illuminated in green.)

If autofocus cannot set correctly, the focusing point will blink. (At the
same time, the auto focus lamp will blink in red)

The focusing distance is from 22.6cm to infinity.
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.