| Date | 1886 |
| Author | Abbe |
| Contribution | Introduced apochromatic objectives. |
| Reference | Bradbury |
| Notes | By using new types of glass, he was able to eliminate the slight green fringe that was seen around objects viewed through achromatic lenses (corrected only for red and blue). This benefit was important only to those working near the limits of high-aperture lenses. |
| Category | Microscopy |
| Pathogen Class | General |
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