Sony a1
Specs
Sensor info
Sony a1 comes with a
35.9 x 24 mm CMOS sensor, which has a diagonal of
43.18 mm (1.7") and a surface area of
861.60 mm².
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 a1 sensor: 35.9 x 24 mm
The sensor has a surface area of 861.6 mm².
There are approx. 50,100,000 photosites (pixels) on this area.
Pixel pitch, which is a measure of the distance between pixels, is 4.14 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 17.14 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 a1 has a pixel density of 5.83 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 a1 compares to other cameras, click here.
Pixel or photosite area is 17.14 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 a1 has a pixel density of 5.83 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 a1 compares to other cameras, click here.
Specifications
Brand:  Sony 
Model:  a1 
Effective megapixels:  50.10 
Total megapixels:  50.50 
Sensor size:  35.9 x 24 mm 
Sensor type:  CMOS 
Sensor resolution:  8669 x 5779 
Max. image resolution:  8640 x 5760 
Crop factor:  1 
Optical zoom:  
Digital zoom:  Yes 
ISO:  Auto, 10032000 (extends to 50102400) 
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, Centerweighted, Highlightweighted, Average, Spot 
Exposure Compensation:  ±5 EV (in 1/3 EV, 1/2 EV steps) 
Shutter priority:  Yes 
Min. shutter speed:  30 sec 
Max. shutter speed:  1/32000 sec 
Builtin flash:  
External flash:  
Viewfinder:  Electronic 
White balance presets:  7 
Screen size:  3" 
Screen resolution:  1,440,000 dots 
Video capture:  
Max. video resolution:  7680x4320 (30p/25p/24p) 
Storage types:  SD/SDHC/SDXC, CFexpress 
USB:  USB 3.0 (5 GBit/sec) 
HDMI:  
Wireless:  
GPS:  
Battery:  NPFZ100 lithiumion battery 
Weight:  737 g 
Dimensions:  128.9 x 96.9 x 80.8 mm 
Year:  2021 
Compare a1 with another camera
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Diagonal
Diagonal is calculated by the use of Pythagorean theorem:
where w = sensor width and h = sensor height
Diagonal = √  w² + h² 
Sony a1 diagonal:
w = 35.90 mm
h = 24.00 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.
Width = 35.90 mm
Height = 24.00 mm
Surface area = 35.90 × 24.00 = 861.60 mm²
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 
Sony a1 pixel pitch:
Sensor width = 35.90 mm
Sensor resolution width = 8669 pixels
Sensor resolution width = 8669 pixels
Pixel pitch =  35.90  × 1000  = 4.14 µm 
8669 
Pixel area
The area of one pixel can be calculated by simply squaring the pixel pitch:
You could also divide sensor surface area with effective megapixels:
Pixel area = pixel pitch²
You could also divide sensor surface area with effective megapixels:
Pixel area =  sensor surface area in mm² 
effective megapixels 
Sony a1 pixel area:
Pixel pitch = 4.14 µm
Pixel area = 4.14² = 17.14 µm²
Pixel area = 4.14² = 17.14 µm²
Pixel density
Pixel density can be calculated with the following formula:
You could also use this 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 a1 pixel density:
Sensor resolution width = 8669 pixels
Sensor width = 3.59 cm
Pixel density = (8669 / 3.59)² / 1000000 = 5.83 MP/cm²
Sensor width = 3.59 cm
Pixel density = (8669 / 3.59)² / 1000000 = 5.83 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:
3. To get sensor resolution we then multiply X with the corresponding ratio:
Resolution horizontal: X × r
Resolution vertical: X
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 → 

Resolution horizontal: X × r
Resolution vertical: X
Sony a1 sensor resolution:
Sensor width = 35.90 mm
Sensor height = 24.00 mm
Effective megapixels = 50.10
Resolution horizontal: X × r = 5779 × 1.5 = 8669
Resolution vertical: X = 5779
Sensor resolution = 8669 x 5779
Sensor height = 24.00 mm
Effective megapixels = 50.10
r = 35.90/24.00 = 1.5 

Resolution vertical: X = 5779
Sensor resolution = 8669 x 5779
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 a1 crop factor:
Sensor diagonal = 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).
Sony a1 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 a1, take the aperture of the lens
you're using and multiply it with crop factor.
Since crop factor for Sony a1 is 1, the equivalent aperture is aperture.
Since crop factor for Sony a1 is 1, the equivalent aperture is aperture.
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inches
Actual size is currently adjusted to screen.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.