| In 1868 he invented the apochromatic lens system for the microscope. |
| The sophisticated apochromatic correction allows these objectives to attain the highest color brilliance and fidelity. |
| In 1868 he invented an apochromatic system of lenses, which had even better colour correction than achromatic lenses, and in 1873 he published a comprehensive analysis of lens theory. |
| I hope the following history of the apochromatic lens designs made by Roland Christen of Astro-Physics is of some interest to the readers. |
| The S8 APO stereomicroscope offers a fully apochromatic corrected optics system. |
| The apochromatic lens, therefore, corrects for chromatic aberration to a greater degree than does an achromatic lens. |
