Sigma SD15 vs. Sigma DP1x

Comparison

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SD15 image
vs
DP1x image
Sigma SD15 Sigma DP1x
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Megapixels
4.70
4.70
Max. image resolution
2640 x 1760 x 3
2640 x 1760 x 3
Note: Both Sigma SD15 and Sigma DP1x use Foveon X3 image sensor, which is a new type of sensor that has 3 layers of photoelements stacked together in 1 pixel location. Traditional CCD/CMOS sensors have 1 pixel for 1 color, whereas Foveon sensor captures all 3 colors (blue, green, and red) at every pixel.

Sensor

Sensor type
Foveon
Foveon
Sensor size
20.7 x 13.8 mm
20.7 x 13.8 mm
Sensor resolution
2655 x 1770
2655 x 1770
Diagonal
24.88 mm
24.88 mm
Sensor size comparison
Sensor size is generally a good indicator of the quality of the camera. Sensors can vary greatly in size. As a general rule, the bigger the sensor, the better the image quality.

Bigger sensors are more effective because they have more surface area to capture light. An important factor when comparing digital cameras is also camera generation. Generally, newer sensors will outperform the older.

Learn more about sensor sizes »

Actual sensor size

Note: Actual size is set to screen → change »
vs
1 : 1
(ratio)
Sigma SD15 Sigma DP1x
Surface area:
285.66 mm² vs 285.66 mm²
Difference: 0 mm² (0%)
SD15 and DP1x sensors are the same size.
Pixel pitch
7.8 µm
7.8 µm
Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next. It tells you how close the pixels are to each other.

The bigger the pixel pitch, the further apart they are and the bigger each pixel is. Bigger pixels tend to have better signal to noise ratio and greater dynamic range.
Difference: 0 µm (0%)
SD15 and DP1x have the same pixel pitch.
Pixel area
60.84 µm²
60.84 µm²
Pixel or photosite area affects how much light per pixel can be gathered. The larger it is the more light can be collected by a single pixel.

Larger pixels have the potential to collect more photons, resulting in greater dynamic range, while smaller pixels provide higher resolutions (more detail) for a given sensor size.
Relative pixel sizes:
vs
Pixel area difference: 0 µm² (0%)
Sigma SD15 and Sigma DP1x have the same pixel area.
Pixel density
1.65 MP/cm²
1.65 MP/cm²
Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor.

Higher pixel density means smaller pixels and lower pixel density means larger pixels.
Difference: 0 µm (0%)
Sigma SD15 and Sigma DP1x have the same pixel density.
To learn about the accuracy of these numbers, click here.



Specs

Sigma SD15
Sigma DP1x
Crop factor
1.74
1.74
Total megapixels
4.70
4.70
Effective megapixels
4.70
4.70
Optical zoom
1x
Digital zoom
No
No
ISO sensitivity
Auto, 100, 200, 400, 800, 1600, 3200
Auto, 50, 100, 200, 400, 800, 1600, 3200
RAW
Manual focus
Normal focus range
30 cm
Macro focus range
Focal length (35mm equiv.)
28 mm
Aperture priority
Yes
Yes
Max. aperture
Max. aperture (35mm equiv.)
n/a
n/a
Metering
Center-weighted average, Centre weighted, Evaluative, Spot
Centre weighted, Evaluative, Spot
Exposure compensation
±3 EV (in 1/3 EV steps)
±3 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
B+30 sec
30 sec
Max. shutter speed
1/4000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Optical (pentaprism)
None
White balance presets
8
6
Screen size
3"
2.5"
Screen resolution
460,000 dots
230,000 dots
Video capture
Max. video resolution
Storage types
SDHC, Secure Digital
SDHC, Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 1.0
HDMI
Wireless
GPS
Battery
Lithium-Ion rechargeable battery
Lithium-Ion rechargeable battery
Weight
750 g
250 g
Dimensions
144 x 107.3 x 80.5 mm
113.3 x 59.5 x 50.5 mm
Year
2010
2010




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Diagonal

Diagonal is calculated by the use of Pythagorean theorem:
Diagonal =  w² + h²
where w = sensor width and h = sensor height

Sigma SD15 diagonal

w = 20.70 mm
h = 13.80 mm
Diagonal =  20.70² + 13.80²   = 24.88 mm

Sigma DP1x diagonal

w = 20.70 mm
h = 13.80 mm
Diagonal =  20.70² + 13.80²   = 24.88 mm


Surface area

Surface area is calculated by multiplying the width and the height of a sensor.

SD15 sensor area

Width = 20.70 mm
Height = 13.80 mm

Surface area = 20.70 × 13.80 = 285.66 mm²

DP1x sensor area

Width = 20.70 mm
Height = 13.80 mm

Surface area = 20.70 × 13.80 = 285.66 mm²


Pixel pitch

Pixel pitch is the distance from the center of one pixel to the center of the next measured in micrometers (µm). It can be calculated with the following formula:
Pixel pitch =   sensor width in mm  × 1000
sensor resolution width in pixels

SD15 pixel pitch

Sensor width = 20.70 mm
Sensor resolution width = 2655 pixels
Pixel pitch =   20.70  × 1000  = 7.8 µm
2655

DP1x pixel pitch

Sensor width = 20.70 mm
Sensor resolution width = 2655 pixels
Pixel pitch =   20.70  × 1000  = 7.8 µm
2655


Pixel area

The area of one pixel can be calculated by simply squaring the pixel pitch:
Pixel area = pixel pitch²

You could also divide sensor surface area with effective megapixels:
Pixel area =   sensor surface area in mm²
effective megapixels

SD15 pixel area

Pixel pitch = 7.8 µm

Pixel area = 7.8² = 60.84 µm²

DP1x pixel area

Pixel pitch = 7.8 µm

Pixel area = 7.8² = 60.84 µm²


Pixel density

Pixel density can be calculated with the following formula:
Pixel density =  ( sensor resolution width in pixels )² / 1000000
sensor width in cm

One could also use this formula:
Pixel density =   effective megapixels × 1000000  / 10000
sensor surface area in mm²

SD15 pixel density

Sensor resolution width = 2655 pixels
Sensor width = 2.07 cm

Pixel density = (2655 / 2.07)² / 1000000 = 1.65 MP/cm²

DP1x pixel density

Sensor resolution width = 2655 pixels
Sensor width = 2.07 cm

Pixel density = (2655 / 2.07)² / 1000000 = 1.65 MP/cm²


Sensor resolution

Sensor resolution is calculated from sensor size and effective megapixels. It's slightly higher than maximum (not interpolated) image resolution which is usually stated on camera specifications. Sensor resolution is used in pixel pitch, pixel area, and pixel density formula. For sake of simplicity, we're going to calculate it in 3 stages.

1. First we need to find the ratio between horizontal and vertical length by dividing the former with the latter (aspect ratio). It's usually 1.33 (4:3) or 1.5 (3:2), but not always.

2. With the ratio (r) known we can calculate the X from the formula below, where X is a vertical number of pixels:
(X × r) × X = effective megapixels × 1000000    →   
X =  effective megapixels × 1000000
r
3. To get sensor resolution we then multiply X with the corresponding ratio:

Resolution horizontal: X × r
Resolution vertical: X

SD15 sensor resolution

Sensor width = 20.70 mm
Sensor height = 13.80 mm
Effective megapixels = 4.70
r = 20.70/13.80 = 1.5
X =  4.70 × 1000000  = 1770
1.5
Resolution horizontal: X × r = 1770 × 1.5 = 2655
Resolution vertical: X = 1770

Sensor resolution = 2655 x 1770

DP1x sensor resolution

Sensor width = 20.70 mm
Sensor height = 13.80 mm
Effective megapixels = 4.70
r = 20.70/13.80 = 1.5
X =  4.70 × 1000000  = 1770
1.5
Resolution horizontal: X × r = 1770 × 1.5 = 2655
Resolution vertical: X = 1770

Sensor resolution = 2655 x 1770


Crop factor

Crop factor or focal length multiplier is calculated by dividing the diagonal of 35 mm film (43.27 mm) with the diagonal of the sensor.
Crop factor =   43.27 mm
sensor diagonal in mm


SD15 crop factor

Sensor diagonal in mm = 24.88 mm
Crop factor =   43.27  = 1.74
24.88

DP1x crop factor

Sensor diagonal in mm = 24.88 mm
Crop factor =   43.27  = 1.74
24.88

35 mm equivalent aperture

Equivalent aperture (in 135 film terms) is calculated by multiplying lens aperture with crop factor (a.k.a. focal length multiplier).

SD15 equivalent aperture

Aperture is a lens characteristic, so it's calculated only for fixed lens cameras. If you want to know the equivalent aperture for Sigma SD15, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Sigma SD15 is 1.74

DP1x equivalent aperture

Aperture is a lens characteristic, so it's calculated only for fixed lens cameras. If you want to know the equivalent aperture for Sigma DP1x, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Sigma DP1x is 1.74

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