| Date | 1807 |
| Author | van Deyl |
| Contribution | Made achromatic objective. |
| Reference | Bradbury |
| Notes | Bradbury does not give the specific date. Deyl (van Deyl or van Deijl) combined a biconvex crown-glass lens with biconcave flint-glass lens (with the concavity facing the object being almost flat). Helped to reduce spherical as well as chromatic aberration. |
| Category | Microscopy |
| Pathogen Class | General |
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