20
Manual Mode - Continued
Iris,
The iris is a tool in a lens that regulates the amount of light that passes through the lens and onto the sensor
by altering the diameter of the hole that the light is entering through. The diameter of the hole is measured in
F-stop value. A higher value lets in less light while a lower setting is more light.
The iris setting affects the length of the depth of field. The higher F-stop you use the deeper your depth of field
– and vice versa. This is because the smaller the aperture, the more focused the light beams will be, resulting
in a more focused image.
DRC
Dynamic Range Compression has a similar effect on the picture as the above mentioned gain limit. The DRC
works by compressing the natural dynamic range of the image by taking out the darkest and lightest parts of
the image. This can be a particular helpful setting when the light conditions are challenging. The differences
should be clearly visible in dark parts of the image, they will become lighter/more grey once the level of DRC
is increased.
SAE Mode, Shutter Auto Exposure
In this mode the shutter speed is user adjustable, the camera itself decides the best iris F-stop value for an
optimal exposure setting.
Keep in mind that the shutter speed is the amount of time that each frame of the sensor has been exposed
to light.
To compensate for poor lighting conditions, it is possible to adjust the DRC or Dynamic Range Compression.
The DRC works by compressing the natural dynamic range of the image by taking out the darkest and ligh-
test parts of the image. This can be a particular helpful setting when the light conditions are challenging. The
differences should be clearly visible in dark parts of the image, they will become lighter/more grey once the
level of DRC is increased.
AAE Mode, Aperture Auto Exposure
The camera will automatically set the shutter speed based on the iris F-stop value (aperture) set by the user.
As the camera determines the preferable shutterspeed it is possible in this mode to turn the antiflicker setting
to the required 50Hz or 60Hz to eliminate the effects of a shutter functioning at 1/50th of a second for
example.
In this mode, both the Gain limit and DRC are available to compensate for challenging light conditions.
Bright mode
This mode is to try and create a decent image when the light conditions are exceptionally poor. In this mode
keep the Bright level, Gain limit and DRC as low as possibly acceptable to avoid getting too much noise in the
picture. If the level of noise in the image becomes unacceptable, noise reduction is available to smooth the
picture over.. (See page 23)
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