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PHOTOGRAPHY BY
Margaret Watson LRPS AFIAP
 

Observatory

Observatory Calculations
 
This is a calculator that I use when I am in the observatory as can get at it over the internet and it keeps my documentation in one common place. It may contain equipment that I don't have as I also use it for modelling different options that I am considering or just interested in.

Celestron EdgeHD 800 SCT
 CCDFocal RatioField Of View
(arc min)
Sampling
(arc sec per px)
Magnification
 Atik 383L+1029.8 x 22.90.5592
 Atik 383L+742.5 x 32.70.7864
Notes:
Corrector plate aperture; diameter 203.2mm, area 32429mm2 (0.032m2)
69mm centre obstruction as; a percentage of aperture area = 12%, a percentage of aperture diameter = 34%
Takahashi FSQ-85EDX
 CCDFocal RatioField Of View
(arc min)
Sampling
(arc sec per px)
Magnification
 Atik 383L+5.29134.4 x 103.32.4720
 Atik 383L+3.86184.4 x 141.73.3915
 Atik 383L+7.9489.6 x 68.91.6530
SSAG Autoguider
 ScopeFocal RatioField Of View
(arc min)
Sampling
(arc sec per px)
Magnification
 SkyWatcher ST-805.057.2 x 45.72.6847
 
 
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