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Hubble Space Telescope image: Hubble finds dark matter ring in galaxy cluster

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Calculators

You can find several aspects of you optical system from the calculators here.
Telescope Focal Length (mm)

CCD field of View

CCD Pixel Size (nm)
Pixel FOV (arcsec):

Magnification

Eyepiece Focal Length (mm):
Pixel FOV (arcsec):