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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

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Visual

Binocular field calculator

AllField of viewSamplingImage scaleFocal ratioFocal length for seeingEyepieceBinocularsResolving powerDust shadowGuide scope

Object

Binoculars

×
mm

Field from

°
Powered by Aladin Lite·CDS / Université de Strasbourg·Imagery: DSS2 (CDS)
10×50
True field
6.5°
Exit pupil
5.0 mm
Full-Moon widths
12.5

10×50 binoculars show 6.5° of sky with a 5.0 mm exit pupil.

TF = 6.5° · P = D / M = 50 / 10.0 = 5.00 mm