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AstroBrainCalculators
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Plan

  • Tonight
  • Targets
    • Saved targets
  • Plan a night
  • Night plans
    • Logbook

Tools

  • Sky atlas
  • Field of View
  • Night Outlook
    • Weather
  • Exposure Lab
  • Calculators
  • Horizon Studio
  • Sequence Studio
    • Nights
    • Projects

Setup

  • Settings
  • About & Support
  • What’s new

Plan

  • Tonight
  • Targets
    • Saved targets
  • Plan a night
  • Night plans
    • Logbook

Tools

  • Sky atlas
  • Field of View
  • Night Outlook
    • Weather
  • Exposure Lab
  • Calculators
  • Horizon Studio
  • Sequence Studio
    • Nights
    • Projects

Setup

  • Settings
  • About & Support
  • What’s new

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Tools

Astronomy calculators

Ten calculators share one setup. Choose your telescope and camera once; every result follows, drawn to scale.

Reducer / Barlow
Binning
″
Field of view2.24° × 1.49°Sampling2.32pxImage scale1.29″/pxFocal ratiof/5.00Focal length for seeing517mmEyepiece24×Binoculars6.5°Resolving power0.97″Dust shadow2.3mmGuide scope2.5:1