| Date | 1889 |
| Author | Abbe |
| Contribution | Produced (at Zeiss) an objective with the highest numerical aperture ever achieved: 1.63. |
| Reference | Bradbury |
| Notes | From this time on, the apochromatic objectives of the leading manufacturers gave resolution that reached the upper theoretical limit of the light microscope (0.25 micrometer). Powell and Lealand, for example, produced in 1892 several lenses with aperture of 1.5. Modern objectives have a somewhat smaller aperture. |
| Category | Microscopy |
| Pathogen Class | General |
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