|Contribution||Designed objective consisting of a series of four achromatic doublets.|
|Notes||The doublets were plano-concave plus biconvex, with convex surface toward object. The microscope was made by Vincent and Charles Chevalier. Corrected chromatic aberration, but this advantage was outweighed by accumulation of spherical aberration with each added doublet, especially with convex surface toward object. This required placement of a diaphragm on top, to reduce aperture, greatly reducing resolution.|
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