Malls Exposure Time Calculator Ver. 2.0
Observation conditions
Seeing size: 1.5 arcsec
Slit width: 0.8 arcsec
Slit filter: Clear
Recommended order cut filter
— See
this page
Calculate S/N ratio
Grating
150
1800
Spectral Type
O
B
A
F
G
K
M
Vega mag
AB mag
at V band
Exposure time
sec
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S/N (4500A) ~
per pixel
S/N (5500A) ~
per pixel
S/N (6500A) ~
per pixel
S/N (7500A) ~
per pixel
S/N (8500A) ~
per pixel
last update : 14 Jan. 2026