FOCAS spectrograph sensitivity calculator

Please note that this calculation is for dark moon phase and the SNR can be much lower when the moon is in the sky.
1. Source:
2. Grism:
3. Seeing: [arcsec]
4. Source flux: [erg/s/cm^2/A] (or [erg/s/cm^2/A/arcsec^2] for extended source)
5. Slit width:
6. Extraction aperture: [pixel]
7. CCD binning:
8. Exposure time: [sec]

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