# Sony a7S III

### Specs compare »
 Brand: Sony Model: a7S III Megapixels: 12.10 Sensor: 35.6 x 23.8 mm Price: check here »

## Sensor info

Sony a7S III comes with a 35.6 x 23.8 mm CMOS sensor, which has a diagonal of 42.82 mm (1.69") and a surface area of 847.28 mm².
Diagonal
42.82 mm
Surface area
847.3 mm²
Pixel pitch
8.36 µm
Pixel area
69.89 µm²
Pixel density
1.43 MP/cm²

## Actual sensor size

Note: Actual size is set to screen → change »
This is the actual size of the a7S III sensor: 35.6 x 23.8 mm
The sensor has a surface area of 847.3 mm². There are approx. 12,100,000 photosites (pixels) on this area. Pixel pitch, which is a measure of the distance between pixels, is 8.36 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 69.89 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. Sony a7S III has a pixel density of 1.43 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 a7S III compares to other cameras, click here.

## Specifications

 Brand: Sony Model: a7S III Effective megapixels: 12.10 Total megapixels: 12.90 Sensor size: 35.6 x 23.8 mm Sensor type: CMOS Sensor resolution: 4260 x 2840 Max. image resolution: 4240 x 2832 Crop factor: 1.01 Optical zoom: Digital zoom: Yes ISO: Auto, 80-102400 (extends to 40-409600) RAW support: Manual focus: Normal focus range: Macro focus range: Focal length (35mm equiv.): Aperture priority: Yes Max aperture: Max. aperture (35mm equiv.): n/a Metering: Multi, Center-weighted, Spot Exposure Compensation: ±5 EV (in 1/3 EV, 1/2 EV steps) Shutter priority: Yes Min. shutter speed: 30 sec Max. shutter speed: 1/8000 sec Built-in flash: External flash: Viewfinder: Electronic White balance presets: 10 Screen size: 3" Screen resolution: 1,440,000 dots Video capture: Max. video resolution: 4264x2408 (60p) Storage types: SD/SDHC/SDXC/MS Pro Duo/CFexpress USB: USB 3.0 (5 GBit/sec) HDMI: Wireless: GPS: Battery: NP-FZ100 lithium-ion battery Weight: 614 g Dimensions: 128.9 x 96.9 x 69.7 mm Year: 2020

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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

### Sony a7S III diagonal:

w = 35.60 mm
h = 23.80 mm
 Diagonal = √ 35.60² + 23.80² = 42.82 mm

## Surface area

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

Width = 35.60 mm
Height = 23.80 mm

Surface area = 35.60 × 23.80 = 847.28 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

### Sony a7S III pixel pitch:

Sensor width = 35.60 mm
Sensor resolution width = 4260 pixels
 Pixel pitch = 35.60 × 1000 = 8.36 µm 4260

## 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

### Sony a7S III pixel area:

Pixel pitch = 8.36 µm

Pixel area = 8.36² = 69.89 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

### Sony a7S III pixel density:

Sensor resolution width = 4260 pixels
Sensor width = 3.56 cm

Pixel density = (4260 / 3.56)² / 1000000 = 1.43 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

### Sony a7S III sensor resolution:

Sensor width = 35.60 mm
Sensor height = 23.80 mm
Effective megapixels = 12.10
r = 35.60/23.80 = 1.5
 X = √ 12.10 × 1000000 = 2840 1.5
Resolution horizontal: X × r = 2840 × 1.5 = 4260
Resolution vertical: X = 2840

Sensor resolution = 4260 x 2840

## 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

### Sony a7S III crop factor:

Sensor diagonal = 42.82 mm
 Crop factor = 43.27 = 1.01 42.82

## 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).

### Sony a7S III 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 Sony a7S III, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Sony a7S III is 1.01

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