Direct Imaging Calculator
Focus:
f/3.3 (Prime Focus Direct)
f/8 (Cassegrain Direct)
f/1 (LBL Imager)
Detector:
WFI (Average) Triplet
Tek (170K)
Tek (200K)
MITLL2 (160K)
Red Thomson
Blue Thomson
Read Speed:
XTRASLOW
SLOW
NORMAL
FAST
NONASTRO
WFI has only one speed - FAST
Bandpass:
U (WFI Schott)
B (WFI Schott)
V (WFI Schott)
R (WFI Schott)
g (WFI SDSS)
r (WFI SDSS)
i (WFI SDSS)
z (WFI SDSS)
U (CuSO4)
B (KPNO)
V (KPNO)
R (KPNO)
I (KPNO)
V (LBL)
R (LBL)
I (LBL)
Select only WFI filters for WFI.
Magnitude:
Calculation assumes g=V,r=R,i=I.
Seeing FWHM("):
1.0
1.5
2.0
2.5
Phase of Moon:
Dark (New Moon)
Grey (6 days after New Moon)
Bright (Full Moon)
Calculation:
Calculate SNR,
enter exposure time
(minutes):
Calculate exposure time,
enter SNR
:
For further information see
The AAO CCD Imaging Manual
Created by Chris Tinney, from a Web form originally developed by Paul Markham.
