Glossary

Sensor Geometry Formulas

updated:  2024-10-11


Some important sensor geometry formulas as used in StarlustDB:


  • MPX: Megapixel on the sensor
  • SAR: Sensor Aspect Ratio
  • Width: Sensor Width in [mm]Height
  • Height: Sensor Height in [mm]
  • SensorDiag: Sensor Diagonal in [mm]
  • PixelPitch in [μm]
  • CF: Crop Factor


Default values correspond to the sensor of the ZWO ASI294 MC Pro Color camera

Calculate Field Of View

SAR =
 NoPixelsX   
NoPixelsX
  =    

Calculate NoPixelsX

NoPixelsX = sqrt(
SAR * MPX )
  =    

Calculate MPX

MPX =
NoPixelsX * NoPixelsY
1,048,576
  =    


Calculate Sensor Diagonal

SensorDiag = sqrt(
Width * Height )   =    





Crop Factor



For more information on sensors, see here:


Online sensor calculator: Pixels Per Inch PPI Calculator (calculatorsoup.com)

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