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
CCD
Focal Ratio
Field Of View (arc min)
Sampling (arc sec per px)
Magnification
Atik 383L+
10
29.8 x 22.9
0.55
92
Atik 383L+
7
42.5 x 32.7
0.78
64
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%
