Sigma DP2x vs. Nikon D800E

Comparison

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DP2x image
vs
D800E image
Sigma DP2x Nikon D800E
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Megapixels
4.70
36.30
Max. image resolution
2652 x 1768 x 3
7360 x 4912
Note: Sigma DP2x uses 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
CMOS
Sensor size
20.7 x 13.8 mm
35.9 x 24 mm
Sensor resolution
2655 x 1770
7379 x 4919
Diagonal
24.88 mm
43.18 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 : 3.02
(ratio)
Sigma DP2x Nikon D800E
Surface area:
285.66 mm² vs 861.60 mm²
Difference: 575.94 mm² (202%)
D800E sensor is approx. 3.02x bigger than DP2x sensor.
Pixel pitch
7.8 µm
4.87 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: 2.93 µm (60%)
Pixel pitch of DP2x is approx. 60% higher than pixel pitch of D800E.
Pixel area
60.84 µm²
23.72 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: 37.12 µm² (156%)
A pixel on Sigma DP2x sensor is approx. 156% bigger than a pixel on Nikon D800E.
Pixel density
1.65 MP/cm²
4.22 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: 2.57 µm (156%)
Nikon D800E has approx. 156% higher pixel density than Sigma DP2x.
To learn about the accuracy of these numbers, click here.



Specs

Sigma DP2x
Nikon D800E
Crop factor
1.74
1
Total megapixels
4.70
36.80
Effective megapixels
4.70
36.30
Optical zoom
1x
Digital zoom
No
Yes
ISO sensitivity
Auto, 100 - 3200
Auto, 100 - 6400
RAW
Manual focus
Normal focus range
28 cm
Macro focus range
Focal length (35mm equiv.)
41 mm
Aperture priority
Yes
Yes
Max. aperture
Max. aperture (35mm equiv.)
n/a
n/a
Metering
Centre weighted, Evaluative, Spot
3D Matrix metering II, Centre weighted, Multi-segment, Spot
Exposure compensation
±3 EV (in 1/3 EV steps)
±5 EV (in 1/3 EV, 1/2 EV, 1 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
15 sec
Bulb+30 sec
Max. shutter speed
1/2000 sec
1/8000 sec
Built-in flash
External flash
Viewfinder
None
Optical (pentaprism)
White balance presets
6
12
Screen size
2.5"
3.2"
Screen resolution
230,000 dots
921,000 dots
Video capture
Max. video resolution
Storage types
SDHC, Secure Digital
CompactFlash type I, SDHC, SDXC, Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 3.0 (5 GBit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion rechargeable battery
Lithium-Ion EN-EL15 rechargeable battery
Weight
280 g
900 g
Dimensions
113.3 x 59.5 x 56.1 mm
146 x 123 x 82 mm
Year
2011
2012




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vs

Diagonal

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

Sigma DP2x diagonal

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

Nikon D800E diagonal

w = 35.90 mm
h = 24.00 mm
Diagonal =  35.90² + 24.00²   = 43.18 mm


Surface area

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

DP2x sensor area

Width = 20.70 mm
Height = 13.80 mm

Surface area = 20.70 × 13.80 = 285.66 mm²

D800E sensor area

Width = 35.90 mm
Height = 24.00 mm

Surface area = 35.90 × 24.00 = 861.60 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

DP2x pixel pitch

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

D800E pixel pitch

Sensor width = 35.90 mm
Sensor resolution width = 7379 pixels
Pixel pitch =   35.90  × 1000  = 4.87 µm
7379


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

DP2x pixel area

Pixel pitch = 7.8 µm

Pixel area = 7.8² = 60.84 µm²

D800E pixel area

Pixel pitch = 4.87 µm

Pixel area = 4.87² = 23.72 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

DP2x pixel density

Sensor resolution width = 2655 pixels
Sensor width = 2.07 cm

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

D800E pixel density

Sensor resolution width = 7379 pixels
Sensor width = 3.59 cm

Pixel density = (7379 / 3.59)² / 1000000 = 4.22 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

DP2x 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

D800E sensor resolution

Sensor width = 35.90 mm
Sensor height = 24.00 mm
Effective megapixels = 36.30
r = 35.90/24.00 = 1.5
X =  36.30 × 1000000  = 4919
1.5
Resolution horizontal: X × r = 4919 × 1.5 = 7379
Resolution vertical: X = 4919

Sensor resolution = 7379 x 4919


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


DP2x crop factor

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

D800E crop factor

Sensor diagonal in mm = 43.18 mm
Crop factor =   43.27  = 1
43.18

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).

DP2x 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 DP2x, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Sigma DP2x is 1.74

D800E 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 Nikon D800E, take the aperture of the lens you're using and multiply it with crop factor.

Since crop factor for Nikon D800E is 1, the equivalent aperture is aperture.

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