With excellent optics and a fully internal zoom design, this lens is well-suited for lunar and solar photography.

Description: A lens which is specially designed to control the effects of chromatic distortion or aberration (a defect of optical lenses to bring the focus of all colours to the same convergence point ...

This article was originally published with the title “ The Discovery of Stellar Aberration ” in Scientific American Magazine Vol. 210 No. 3 (March 1964), p. 100 doi:10.1038 ...