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Sigma SD15 User Manual

Sigma SD15
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91
HISTOGRAM
The histogram is a graph depicting the distribution of brightness values in
the image for each of the three color channels (Red, Green, and Blue) (The
histogram displayed in the Quick Preview is the distribution of tones in the
image). The horizontal axis shows the brightness level, with darker pixels
towards the left side and brighter pixels toward the right. The vertical axis
shows the proportion of pixels at each level of brightness.
By examining the histogram of the full image, you can gauge the over-all
exposure of that image. You can also use the histogram to determine if
zoomed-in sections of an image are over or under exposed.
This histogram shows that the higher pixel
values are never used in the image,
indicating that the image is underexposed,
and therefore will appear dark. In general,
when the histogram is higher on the left side,
the image is mostly composed of dark pixels,
causing it to appear dark—either because
the image is underexposed or because it is a
dark scene such as night shot or sunset.
This histogram shows a fairly even
distribution of pixel values, indicating that the
image is well exposed, with good contrast.
However, the histogram distribution of a well
exposed image will vary greatly depending
on the subject.
This histogram shows that many of the pixel
values are at their brightness limit, indicating
that some areas of the image may be blown
out. In general, when the histogram runs off
the right side, the image will have many white
pixels—either because the image is
overexposed or because it is a bright scene
such as the beach or snow.

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Sigma SD15 Specifications

General IconGeneral
Camera TypeInterchangeable Lens SLR Type Digital Camera
Image Sensor Size13.8 x 20.7mm
Lenses UsedSigma SA Mount Lenses
Picture AngleEquivalent to 1.7x the focal length of a lens when used on a 35mm SLR camera.
Lens MountSA mount
Imaging Element TypeFOVEON® X3™ (CMOS)
Color Photo Detectors14.06 Million (2652 Columns x 1768 Rows x 3 Layers)
Image Recording FormatLossless compression RAW Data (12bit), JEPG
White Balance8 Type (Auto, Sunlight, Shade, Overcast, Incandescent, Fluorescent, Flash, Custom white balance)
Viewfinder TypePentaprism SLR Viewfinder
Viewfinder Frame Coverage98% horizontal, 98% vertical
Viewfinder Magnification0.9x (50mm F1.4 at infinity)
Eyepoint18mm
Diopter Adjustment Range-3dpt to +1.5dpt
Auto Focus TypeTTL phase difference detection system
AF Operating RangeEV 0 to 18 (ISO100)
Focus ModeSingle AF, Continuous AF (AF Predict function), MF
Metering SystemsEvaluative Metering, Center-Weighted Average Metering, Center Area Metering, Spot metering
Metering RangeEV 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 SensivityISO (50), 100, 200, 400, 800, 1600, (3200) *( )Extended Mode
Exposure Compensation±3EV (in 1/3steps)
AE LockPush button type
Auto BracketingThree or five frames (in 1/3steps, Appropriate Exposure – Under Exposure – Over Exposure)
Shutter TypeVertical-travel metal focal plane shutter, electronically controlled through entire speed range
Storage MediaSD Card / Compatible with SDHC, Multi Media Card
Aspect Ratio3:2
ResolutionHI:2640 x 1760 MED:1872 x 1248, LOW:1312 x 880
InterfacesUSB 2.0, Video Out (NTSC/PAL)

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