Ghost reduction device, image pickup apparatus including the same, ghost reduction method, and image pickup optical system

摘要

[Subject(s)] To offer a ghost reducing device and an imaging device provided with it, a ghost reducing method, and an imaging optical system that can effectively reduce ghosts while having a simple and inexpensive configuration. [Means to Solve] A ghost reducing device includes a douser that has at least one opening that lets light pass through, and that totally blocks light in a symmetrical position of the opening with respect to an optical axis of an imaging optical system. The douser is disposed in the vicinity of a pupil position of the imaging optical system.