Sigma DP1 Merrill


Brand: Sigma
Model: DP1 Merrill
Megapixels: 15.40
Sensor: 24 x 16 mm
Price: check here »

Sensor info

Sigma DP1 Merrill comes with a 24 x 16 mm Foveon sensor, which has a diagonal of 28.84 mm (1.14") and a surface area of 384.00 mm².
Note: Sigma DP1 Merrill uses Foveon X3 sensor, which 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.
28.84 mm
Surface area
384 mm²
Pixel pitch
4.99 µm
Pixel area
24.9 µm²
Pixel density
4.01 MP/cm²
If you want to know about the accuracy of these numbers, click here.

Actual sensor size

Note: Actual size is set to screen → change »
This is the actual size of the DP1 Merrill sensor: 24 x 16 mm
The sensor has a surface area of 384 mm². There are approx. 15,400,000 photosites (pixels) on this area. Pixel pitch, which is a measure of the distance between pixels, is 4.99 µm. Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next.

Pixel or photosite area is 24.9 µm². The larger the photosite, the more light it can capture and the more information can be recorded.

Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor. Sigma DP1 Merrill has a pixel density of 4.01 MP/cm².

These numbers are important in terms of assessing the overall quality of a digital camera. Generally, the bigger (and newer) the sensor, pixel pitch and photosite area, and the smaller the pixel density, the better the camera. If you want to see how DP1 Merrill compares to other cameras, click here.


Brand: Sigma
Model: DP1 Merrill
Effective megapixels: 15.40
Total megapixels: 15.40
Sensor size: 24 x 16 mm
Sensor type: Foveon
Sensor resolution: 4806 x 3204
Max. image resolution:
Crop factor: 1.5
Optical zoom:
Digital zoom:
RAW support:
Manual focus:
Normal focus range:
Macro focus range:
Focal length (35mm equiv.):
Aperture priority:
Max aperture: f2.8
Max. aperture (35mm equiv.): f4.2
Depth of field: simulate →
Exposure Compensation:
Shutter priority:
Min. shutter speed:
Max. shutter speed:
Built-in flash:
External flash:
Viewfinder: None
White balance presets:
Screen size:
Screen resolution: 920,000 dots
Video capture:
Storage types:
USB: USB 2.0 (480 Mbit/sec)
Weight: 330 g
Dimensions: 122 x 67 x 64 mm
Year: 2012

Compare DP1 Merrill with another camera



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

Sigma DP1 Merrill diagonal:

w = 24.00 mm
h = 16.00 mm
Diagonal =  24.00² + 16.00²   = 28.84 mm

Surface area

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

Width = 24.00 mm
Height = 16.00 mm

Surface area = 24.00 × 16.00 = 384.00 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

Sigma DP1 Merrill pixel pitch:

Sensor width = 24.00 mm
Sensor resolution width = 4806 pixels
Pixel pitch =   24.00  × 1000  = 4.99 µm

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

Sigma DP1 Merrill pixel area:

Pixel pitch = 4.99 µm

Pixel area = 4.99² = 24.9 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

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

Sigma DP1 Merrill pixel density:

Sensor resolution width = 4806 pixels
Sensor width = 2.4 cm

Pixel density = (4806 / 2.4)² / 1000000 = 4.01 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
3. To get sensor resolution we then multiply X with the corresponding ratio:

Resolution horizontal: X × r
Resolution vertical: X

Sigma DP1 Merrill sensor resolution:

Sensor width = 24.00 mm
Sensor height = 16.00 mm
Effective megapixels = 15.40
r = 24.00/16.00 = 1.5
X =  15.40 × 1000000  = 3204
Resolution horizontal: X × r = 3204 × 1.5 = 4806
Resolution vertical: X = 3204

Sensor resolution = 4806 x 3204

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

Sigma DP1 Merrill crop factor:

Sensor diagonal = 28.84 mm
Crop factor =   43.27  = 1.5

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).

Sigma DP1 Merrill equivalent aperture:

Crop factor = 1.5
Aperture = f2.8

35-mm equivalent aperture = (f2.8) × 1.5 = f4.2

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