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What is the pixel pitch of the Sony A7R?

The Sony Alpha A7R provides 36.2 megapixels from a full frame sensor. This pixel density gives rise to a size of the individual pixel of 4.88µm.

The pixel size or pixel pitch can be calculated by dividing the sensor area by the pixel count and then taking the square root. In particular, the sensor in the Sony A7R measures 35.9mm in width and 24.0mm in height, so that the total imaging area of the sensor amounts to 862 mm2. Moreover, the A7R has 7 360 horizontal pixels and 4 912 vertical pixels, for a total of 36.2 megapixels. Then, the size (height or width) of each individual pixel can be calculated as the square root of the ratio of the sensor area (862 mm2) to the MP count (36 152 320).

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Larger pixels provide advantages with respect to gathering light, particularly in low-light situations. Large pixels notably have a better signal to noise ratio, meaning that they can better differentiate between incoming photons and the noisy signals that the internal processes of the camera create. As a result, big pixels are particularly helpful to the photographer when shooting with high ISO settings.

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Sensor specs and performance

The table below compares the sensor specs of the Sony A7R to those of several similar cameras. The reported DXO values are indicators of the sensor's imaging quality (higher is better), covering color depth (DXO Portrait), dynamic range (DXO Landscape), and high-ISO noise (DXO Sports). Larger sensor cameras tend to outperform cameras of the same generation that are equipped with a smaller imager. On the other hand, larger sensors are more expensive and require bigger and heavier lenses than smaller light receptors.

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Sensor Characteristics
#   Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Sony A7R Full Frame 36.2 7360 49121080/60p25.614.1274695
2.
 
Nikon D810 Full Frame 36.2 7360 49121080/60p25.714.8285397
3.
 
Sony A7C II Full Frame 32.7 7008 46724K/60p25.414.7323796
4.
 
Sony A7 IV Full Frame 32.7 7008 46724K/60p25.414.7337997
5.
 
Sony A7R II Full Frame 42.2 7952 53044K/30p26.013.9343498
6.
 
Sony RX1R II Full Frame 42.2 7952 53041080/60p25.813.9320497
7.
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990
8.
 
Sony A7S Full Frame 12.0 4240 28321080/60p23.913.2370287
9.
 
Sony A7 Full Frame 24.0 6000 40001080/60p24.814.2224890
10.
 
Sony RX1R Full Frame 24.0 6000 40001080/60p25.013.6253791
11.
 
Sony RX1 Full Frame 24.0 6000 40001080/60p25.114.3253493
Note: DXO values in italics represent estimates based on sensor size and age.
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Further information on the sensor in the Sony A7R and the camera's operation can be found in the camera manual.

In the United States, the A7R was initially launched in October 2013 at a price of $2,299.

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Camera to camera comparisons

In case you are interested in seeing how this camera compares to another one, just make a corresponding selection in the search boxes below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications Summary
    Camera Model Sony A7R
    Camera Type Mirrorless system camera
    Camera Lens Sony E mount lenses
    Launch Date October 2013
    Launch Price USD 2 299
    Sensor Specs
    Sensor Technology CMOS
    Sensor Format Full Frame Sensor
    Sensor Size 35.9 x 24.0 mm
    Sensor Area 862 mm2
    Sensor Diagonal 43.2 mm
    Crop Factor 1.0x
    Sensor Resolution 36.2 Megapixels
    Image Resolution 7 360 x 4 912 pixels
    Pixel Pitch 4.88 μm
    Pixel Density 4.20 MP/cm2
    Moiré control no AA filter
    Movie Capability 1080/60p Video
    ISO Setting 100 - 25 600 ISO
    ISO Boost 50 - 51 200 ISO
    Image Processor BIONZ X
    DXO Sensor Quality (score) 95
    DXO Color Depth (bits) 25.6
    DXO Dynamic Range (EV) 14.1
    DXO Low Light (ISO) 2746
    Screen Specs
    Viewfinder Type Electronic viewfinder
    Viewfinder Field of View 100%
    Viewfinder Magnification 0.71x
    Viewfinder Resolution 2400k dots
    Top-Level Screen no Top Display
    LCD Framing Live View
    LCD Size 3.0 inch
    LCD Resolution 1230k dots
    LCD Attachment Tilting screen
    V-logging Friendliness No front-flip
    Touch Input No touchscreen
    Shooting Specs
    Focus System Contrast-detect AF
    Manual Focusing AidFocus Peaking
    Maximum Shutter Speed 1/8000s
    Continuous Shooting 4 shutter flaps/s
    Shutter Life Expectancy250 000 actuations
    Silent Shootingno E-Shutter
    Time Lapse Photographyno Intervalometer
    Fill Flash no On-Board Flash
    Storage Medium MS or SDXC cards
    Single or Dual Card Slots Single card slot
    UHS card support UHS-I
    Connectivity Specs
    External Flash Hotshoe
    USB Connector USB 2.0
    HDMI Port micro HDMI
    Microphone Port External MIC port
    Headphone Socket Headphone port
    Wifi Support Wifi built-in
    Near-Field Communication NFC built-in
    Body Specs
    Environmental SealingWeathersealed body
    Battery Type Sony NP-FW50 power pack
    Battery Life (CIPA)340 shots per charge
    In-Camera Charging USB charging
    Body Dimensions 127 x 94 x 48 mm
    (5.0 x 3.7 x 1.9 in)
    Camera Weight 465 g (16.4 oz)

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