Airy Disk / Diff. Limit calculator
Diffraction-limited spot size from wavelength and f/#.
Category: Diffraction
Formula: d = 2.4393·λ·N · θ = 1.2197·λ/D (2·j₁,₁/π, j₁,₁/π; ≈ 2.44, 1.22)
Inputs
| Input | Parameter | Unit | Default |
|---|---|---|---|
| Wavelength | lam | nm | 550 |
| f-number | N | 5.6 | |
| Aperture | D | mm | 100 |
Result with the default inputs
- Airy disk Ø: 7.5132 µm
- Angular res.: 6.7082 µrad
- Angular res.: 1.3837 arcsec
Open it with your own values: put each input in the address as a parameter, for example /calculators/airy-disk-diff-limit?lam=550. A unit other than the listed one goes in <parameter>_unit.