achromat
/ˈeɪkrəˌmæt/
noun
- A lens or optical system that corrects for chromatic aberration, bringing two colors (usually red and blue) to the same focus.
- The telescope's achromat produced a much clearer image of the moon than the old single-lens model.
- Modern binoculars often use an achromat to keep the view sharp and free of rainbow edges.
- When building the microscope, the technician carefully aligned the achromat to reduce color fringing.