Lens device, filter unit, and imaging apparatus

A lens device comprising a filter unit in an optical path,

• wherein the filter unit has a plurality of opening portions including a first opening portion and a second opening portion,
• at least the first opening portion and the second opening portion each include a band-pass filter, and each include an optical element on at least one of an object side or an image side of the band-pass filter,
• the optical element is composed of a polarized light filter and a wave plate which converts linearly polarized light into circularly polarized light or elliptically polarized light,
• the first opening portion and the second opening portion pass light in different wavelength regions and different polarization directions, and
• at least one of the first opening portion and the second opening portion further includes a half-wave plate on an image side of the optical element disposed on the image side of the band-pass filter.

A filter unit that is disposed in an optical path of a lens device, the filter unit comprising:

• a plurality of opening portions including a first opening portion and a second opening portion,
• wherein at least the first opening portion and the second opening portion each include a band-pass filter, and each include an optical element on at least one of an object side or an image side of the band-pass filter,
• the optical element is composed of a polarized light filter and a quarter-wave plate which is tilted by 45° with respect to a transmission axis of the polarized light filter, and
• the first opening portion and the second opening portion pass light in different wavelength regions and different polarization directions.