| Date | 1821 |
| Author | Amici |
| Contribution | Made first effective achromatic microscope. |
| Reference | Collard |
| Notes | See 1824 for more on Amici. In the early years of the !9th century, many attempts were made to make achromatic objectives. These were inspired by the mid-18th century discovery that, despite Newton's views, it was possible to make telescope lenses with considerable correction of chromatic and spherical aberration. Application to microscopes had limited success initially; but in the 19th century achromatic microscopes became important in the discovery of "germs." |
| Category | Microscopy |
| Pathogen Class | General |
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