Minimum Detection Limit for Telescope/Filter/Camera system

Defining minimum detection limit as that Lux level at 550nm where S/N of a signal limited image = 1, we can compute the the lux level where that occurs.


The parameters used:

Telescope: 2500mm f/7.4

Telescope optical transmission: 90%

Filter optical transmission: 85%

Camera window optical transmission: 95%

QE: 65%

Exposure time: 1 second


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