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Comparison of the range of angles picked up by microscope lenses with different numerical apertures (N.A.) and the colored area observed in a photonic ball
| Objective lens | 5× | 10× | 20× | 50× |
| N.A. | 0.13 | 0.25 | 0.40 | 0.50 |
| Collection angle | 7° | 14° | 24° | 30° |
| Photonic balls | ||||
| dspot/dsphere | 0.1 | 0.2 | 0.24 | 0.3 |
| Calculated collection angle | 10° | 15° | 27° | 33° |
The angular range calculated from the colored area coincides with the angular range calculated from the N.A. [α = sin−1 (N.A.) for objectives used in air].
