BSL Deep-Sky Imaging – Relative Special Response

Relative Special Response (RSR)

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Horizon ~ Wavelength (nm):
To measures how sensitive an image sensor is across different wavelengths of light relative to its highest sensitivity point.
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Vertical ~ Peak Quantum Efficiency (High Peak QE):
It is a key specification for image sensors (CMOS/CCD) used in astrophotography and digital imaging.
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Relative Special Response (RSR):
Wavelength tells you which light is hitting the sensor, QE tells you the exact efficiency of the conversion, and RSR shows you the shape of the senor’s sensitivity curve relative to its best-performing wavelength.

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