Angular Resolution Calculator
Smallest angle a telescope or lens can resolve (Rayleigh limit) from aperture and wavelength.
Compare Your Options And Get Clear Answers
Smallest angle a telescope or lens can resolve (Rayleigh limit) from aperture and wavelength.
Angular Resolution Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Angular Quick Guide
Typical values for reference.
| Aperture mm | Wavelength nm | Distance km | Resolution |
|---|---|---|---|
| 50 | 550 | 384400 | 2.768 arcsec |
| 100 | 550 | 384400 | 1.384 arcsec |
| 200 | 550 | 384400 | 0.692 arcsec |
| 1000 | 550 | 384400 | 0.138 arcsec |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Angular Resolution Calculator FAQ
Answers to common questions about this calculator.
Two sources are just resolved when the peak of one falls on the first minimum of the other.
A larger aperture reduces the diffraction limit.
theta = 1.22 x wavelength / aperture.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.