optical system
assembly of optical components, or equivalently a system consisting of regions of material with varying refractive indices
coelostat
special telescope with automatic tracking
condenser
lens, mirror or mirror-lens optical system
catadioptric system
optical system where refraction and reflection are combined
optical instrument
scientific instrument using light waves for image viewing
manual focus
photographic system or mode where the user directly sets focus distance
Raster
Type of an optical system
triplet lens
compound lens consisting of three single lenses
diffraction grating
optical system diffracting light into several components based on interference
optic vehicle
optical system able to translate an image