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	Telescope Calculator  Aperture:  mm or  inch   Focal Ratio or Length:   f/   or  mm   Eyepiece:  mm  Apparent Field:  degrees  Barlow Lens:  X                              Magnification Range:  X to  X  Light Grasp:  X  Resolving Power:  arc seconds   Limiting Magnitude:    Magnification:   X  True Field:   arc minutes    Exit Pupil:   mm