Definitions for "Manual Iris"
Keywords:  iris, aperture, lenses, autoiris, lens
Diaphragm controlled directly by a calibrated ring on the lens barrel.
Facility for opening and closing the iris on a camcorder manually to change exposure - found only on a few camcorders. All camcorders have an automatic iris facility.
Lens is a lens with a built-in method of manually adjusting lens aperture for the best video quality for a specific lighting condition. Iris control on such a lens is set by hand to a particular fixed aperture, allowing for the best possible (often better than auto-iris lenses) brightness and contrast for a specific camera angle / shot.