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
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%

Takahashi FSQ-85EDX
CCD	Focal Ratio	Field Of View (arc min)	Sampling (arc sec per px)	Magnification
Atik 383L+	5.29	134.4 x 103.3	2.47	20
Atik 383L+	3.86	184.4 x 141.7	3.39	15
Atik 383L+	7.94	89.6 x 68.9	1.65	30

SSAG Autoguider
Scope	Focal Ratio	Field Of View (arc min)	Sampling (arc sec per px)	Magnification
SkyWatcher ST-80	5.0	57.2 x 45.7	2.68	47