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.
This is the opposite of an autoiris, i.e. the camera iris must be adjusted manually to regulate the amount of light allowed to reach the image sensor.
Manually changing the size of a lenses aperture.
A manual method of varying the size of a lens’s aperture.
In low light settings, capturing clear shots can be difficult. By using the Manual Iris through the dedicated Iris Dial, you can adjust the amount of light that enters through the lens. This enables the camera to optimise the image. Brightness can be adjusted from F1.6 to F11 (24 steps). For you convenience, the Iris Dial can turn in either clockwise direction when pre-assigned on the camera menu.