Definition of achromat in English:
A lens that transmits light without separating it into constituent colours.
- Quartz-sapphire and quartz-lanthanum fluoride achromats provide better performance.
- The long focus achromat is certainly not portable but it does give superb images at a reasonable cost.
- The two-element lenses used in today's achromats greatly reduce the chromatic aberration.
Definition of achromat in:
- US English dictionary