Sigma SD15 User Manual

51
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.
■ 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.
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.

Sigma SD15 Specifications

General

Camera Type	Interchangeable Lens SLR Type Digital Camera
Image Sensor Size	13.8 x 20.7mm
Lenses Used	Sigma SA Mount Lenses
Picture Angle	Equivalent to 1.7x the focal length of a lens when used on a 35mm SLR camera.
Lens Mount	SA mount
Imaging Element Type	FOVEON® X3™ (CMOS)
Color Photo Detectors	14.06 Million (2652 Columns x 1768 Rows x 3 Layers)
Image Recording Format	Lossless compression RAW Data (12bit), JEPG
White Balance	8 Type (Auto, Sunlight, Shade, Overcast, Incandescent, Fluorescent, Flash, Custom white balance)
Viewfinder Type	Pentaprism SLR Viewfinder
Viewfinder Frame Coverage	98％ horizontal, 98％ vertical
Viewfinder Magnification	0.9x (50mm F1.4 at infinity)
Eyepoint	18mm
Diopter Adjustment Range	-3dpt to +1.5dpt
Auto Focus Type	TTL phase difference detection system
AF Operating Range	EV 0 to 18 (ISO100)
Focus Mode	Single AF, Continuous AF (AF Predict function), MF
Metering Systems	Evaluative Metering, Center-Weighted Average Metering, Center Area Metering, Spot metering
Metering Range	EV 1 to 20 (with 50mm F1.4 at ISO100)
Exposure Modes	(P) Program AE、(A) Aperture Priority AE、 (S) Shutter Speed Priority AE、(M) Manual
ISO Sensivity	ISO (50), 100, 200, 400, 800, 1600, (3200) *( )Extended Mode
Exposure Compensation	±3EV (in 1/3steps)
AE Lock	Push button type
Auto Bracketing	Three or five frames (in 1/3steps, Appropriate Exposure – Under Exposure – Over Exposure)
Shutter Type	Vertical-travel metal focal plane shutter, electronically controlled through entire speed range
Storage Media	SD Card / Compatible with SDHC, Multi Media Card
Aspect Ratio	3：2
Resolution	HI：2640 x 1760 MED：1872 x 1248, LOW：1312 x 880
Interfaces	USB 2.0, Video Out (NTSC／PAL)