ASI Cameras User Guide
Capture parameter setting
Gamma: 50 is the default linear output data. This is the recommended setting.
But you can use lower value to help focus when previewing. always remember
to return it to “50” before starting capture! Otherwise onion ring will be there
after stacking and processing.
Gain: the higher the value, the more noise there will be. But it is often needed
to be set high to achieve short exposures/faster frame-rates which can help to
freeze seeing: remembering that faster FPS will result in more frames to stack
which will drastically reduce the noise problems associated with High Gain.
Exposure: the shorter the value, the faster the fps achieved. Fps is usually
calculated like this: fps = 1000 ÷ exposure time (in milliseconds, mS). For
example, 20mS provides 1000 ÷ 20 = 50FPS.
But there are limits to USB2.0 bandwidth and the sensor’s capability. Usually
30-40fps is a good choose for dim object like Saturn and you can achieve
higher fps when capturing bright objects like Jupiter and Mars, Venus.
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