What is meant by coated optics?
The lenses of telescopes may be coated with special chemical coatings to reduce light loss and glare due to reflection in order to produce a brighter, higher-contrast image with less eyestrain. Several different levels of coating may be found: 1. Coated: A single layer applied on at least one lens surface. 2. Fully Coated: A single layer applied on all air-to-glass surfaces. 3. Multi-Coated: Multiple coating layers applied on at least one lens surface. 4.Fully Multi-Coated: Multiple coating layers applied on all air-to-glass surfaces.
