Malls Exposure Time Calculator


These calculation are based on the following conditions.

==Star spectral type B1==

seeing size = 1.5 arcsec
slit width = 0.8 sec
slit filter = Clear
recommended order cut filter --See this page


Calculate S/N ratio

Grating
Center Wevelength
V mag
Expsure time sec





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Calculate Exposure time

Grating
Center Wevelength
V mag
S/N ratio





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last update : 3 Oct 2018