Optical system for camera focussing, uses prism or combined prism and condenser to allow folding of beam to fit more compact housing and reduce coma aberration

摘要

Use of prism to fold beam in a focussing system and provide ray passage along condenser central ray. Prism and condenser may be combined in one optical element The system includes a folding mirror reflector (25), a prism (35) and a condenser lens (31). There is also a lens (27a) and a line sensor (29).