SBIG STC-7 CAMERA
USER’S MANUAL
22
This approach makes it easy to adjust the total exposure time as needed,
without having to worry about always adjusting the subexposures manually.
If you always want the maximum number of subexposures, then leave the
Subframe Exposure
set to 1 second.
On the other hand, if your shorter exposures are not going to cause sensor
saturation, you may wish to avoid the extra read noise for short exposures.
You may therefore wish to increase the
Subframe Exposure
target to 10
seconds.
If you are taking very long exposures at very low light levels, then you may
wish to set the
Subframe Exposure
target to 30 to 60 seconds or more.
As a general rule, the ideal
Subexposure Duration
target should be modestly
below the level where you expect to see sensor saturation occur. That provides
the maximum dynamic range with the minimum extra read noise.
