M Plan APO (Apochromat) Objective for NIR is an optimized optical system, with the flat and chromatic aberration free image over the entire field of view, with coating covers 532-1100nm. This series ...

Achromatic lenses and semi-plan lenses are used to improve the alignment of colors at the focal point in order to provide a clearer image. They differ in terms of glass type, cost, and index of ...

To reduce distortions such as elongations and blurriness caused by the curvature of the "objective" lens—the convex lens at the far end of the telescope—Galileo ground a lens larger than he ...

This exercise is intended to show students how theoretical frameworks can be deployed as "lenses" through which to talk about particular research questions and historical cases. The instructor selects ...