NAC Image Technology SP-642, User Manual

Page: 121 / 436

(00292)H 4 - 45
■AE Control
HX cameras, GX-1/GX-3, GX-8 cameras and fx-K5 cameras have an AEC function (automatic
exposure). The AEC function measures light in the specific area of an image to be photographed
and changes the shutter speed so the average brightness of the measured area is a specific value.
While it is possible to set the lens aperture or the shutter settings to match the brightness for
indoor photography, it is difficult to change the settings each time the brightness changes when
outdoors. The AEC function is useful in this type of situation.
Since the constant varies when the shutter speed is changed, it takes several seconds to focus to
the appropriate value when the brightness changes suddenly.
Any of the following can be used to specify AE.
・ Right click the camera item in the “Item List” and select "AE" from the menu.
・ Select the camera in the “Item List” and select "AE" from the "Control" menu.
・
Select "AE" from the "Control" window.
・ Select "AE" from the recording parameters in the “Camera Details" dialogue.
・
Select "AE" from the "Recording Parameters" in the "List of Camera Settings ".
Select any of the following for AE.
OFF AE not used.
LOW Adjust to a low level of average brightness.
NORMAL Adjust to a normal level of average brightness.
HIGH Adjust to a high level of average brightness.
The upper limit for the AE exposure time is up to the shutter speed set for the recording
parameters. For example, if the shutter speed is set to 5K, the exposure time with AEC control is
up to a maximum of 200[μs].
Also, when using AE, the range subject to the AE (AOI) must be specified.
With HX cameras and GX-1/GX-3/GX-8 cameras, in addition to selecting from predetermined
ranges, custom ranges can be set. Refer to page 4-46 for AOI details.
AEC for fx-K5 includes settings determining the cycle that changes the shutter speed (AE
CYCLE). This setting should not be used to change the shutter speed frequently.
HX and GX cameras do not have this setting.
To designate the AE CYCLE, enter an integer from the "AE CYCLE" in the recording parameters
of the "Camera Details" dialogue in millisecond units.
When using AEC, the exposure time for the recorded frames will change for each frame.
Since HX and GX cameras have a time stamp function, when that function is employed, it is
possible to know the frame exposure time from the information saved for each frame.
The fx-K5 does not have a time stamp function but instead, the final 8 shutter speeds during
recording and their frame range is saved. If the shutter setting is set not to change frequently, it is
possible to know the fx-K5 exposure time for each frame.
When the “Frame Straddling” function is disabled in the HX camera and GX-8, the AE
control settings are disabled and AE controls are turned OFF.
When AE controls are ON, the “Image Trigger” function settings are disabled and the
“Image Trigger” is turned OFF.
Caution
Caution