Resolution in nanometers to numerical aperture
Type a value in nm to get it in NA instantly.
0.6501NA
That's about the same as a 40× objective. It can separate detail down to about 423 nm.
Convert the other way: NA to nm
What it means
How fine can it see?
Resolution figures use green light at 550 nm and the Abbe limit. Shorter wavelengths resolve finer, which is why electron microscopes exist.
The math
How to convert nm to NA
Resolution and aperture are reciprocals through the wavelength: resolution = λ ÷ 2NA, which at 550 nm is 275 ÷ NA nanometers. The collection angle is arcsin(NA).
Example: 423 nm = 0.650118 NA.
Every unit
Your aperture in every unit
Tables
nm to NA conversion table
| nm | NA |
|---|---|
| 196 nm | 1.40306 NA |
| 220 nm | 1.25 NA |
| 289 nm | 0.951557 NA |
| 324 nm | 0.848765 NA |
| 367 nm | 0.749319 NA |
| 423 nm | 0.650118 NA |
| 688 nm | 0.399709 NA |
| 1,100 nm | 0.25 NA |
| 2,750 nm | 0.1 NA |
| 6,880 nm | 0.0399709 NA |
NA to nm conversion table
| NA | nm |
|---|---|
| 0.04 NA | 6,875 nm |
| 0.1 NA | 2,750 nm |
| 0.25 NA | 1,100 nm |
| 0.4 NA | 687.5 nm |
| 0.65 NA | 423.077 nm |
| 0.75 NA | 366.667 nm |
| 0.85 NA | 323.529 nm |
| 0.95 NA | 289.474 nm |
| 1.25 NA | 220 nm |
| 1.4 NA | 196.429 nm |
Quick answers
Quick answers
- How many NA is 1 nm?
- 1 nm is 275 NA.
- How many NA is 10 nm?
- 10 nm is 27.5 NA.
- How many NA is 423 nm?
- 423 nm is 0.650118 NA.
The units
About these units
Resolution in nanometers (nm)
The finest detail it can separate, by the Abbe limit.
Numerical aperture (NA)
The sine of the collection half-angle, times the refractive index.
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