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On-Screen Display (OSD)
ALC/ELC: There are two exposure control modes available on this camera. ELC
mode is normally
used when conditions are known where ALC mode can be used in
more demanding situations.
ELC Mode
While in the main Menu move the cursor to ALC/EL
ELC mode. Push the selection button to enter ELC me
can use t
he arrow keys to change the LEVEL of expo
s
cientific and industrial purposes where lighting conditi
ALC Mode
If you choose AL
C mode you will be able to set the
m
ode to on/off or auto mode. When set to OFF the cam
sm
ear rejection camera". When in AUTO mode the camera will enter in super wide
dynamic mode that will allow the on-board CPU to optimise the exposure. Finally
when set to OFF the user can take control of exposure values taking advantage of the
camera wide dynamic features.
AUTO mode
In this mode the on-board CPU will take control of all functions to produce a best shot
but the user still has control of the Auto Iris level to optimise the exposure between 70
IRE and 150 IRE as well as choose normal or dual white balance mode.
In dual white balance mode the camera will perform very well when there are marked
levels of contrast in the picture, i.e. a planet on a dark background or when lighting
temperatures from various light sources are different which is common in wide angle
astrophotography.
ON mode - super wide dynamic mode with manual interleaving
Once ON has been selected you will be able to choose the percentage weighting of
bright and dark zones to compose the best image. You can choose different IRIS
ranges to optimise the aperture, and use W W/B to select from single or dual white
b
alance mode.
Dual white balance mode will use an independent white balance algorithm for bright
and dark zones, this will offer optimised colour rendering versus compromised colour
rendering as found in non dynamic cameras. You will not be able to change the
shutter speed as the on-board CPU controls this.
Off mode -super smear mode
When WDR is set to OFF the camera will turn this camera into a "super smear
rejection camera". The 450CD series cameras are equipped with dual image memory
used in super wide dynamic processing.
Once the super wide dynamic feature is turned off the extra memory is used to enable
"super smear rejection". Subsequently the camera is upgraded to a 154 dB smear
r
ejection ratio camera (c
ompared to 95 ~ 110 dB of other cameras). This will allow
© Opticstar Ltd 2003, 2004
C
, push the right a
rrow
nu. Once in the ELC m
sure. This mode is mainly for
ons are steady
.
camera's super wide dynamic
era will perform at as a "sup
to sele
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enu yo
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13
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