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Old 16-03-2017, 10:44 AM
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sjastro
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Join Date: Jun 2007
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Robin,

I think the main culprit is the overexposure.
My CCD does not use anti blooming gates.
The spectrum was not only saturated indicating the CCD response was no longer linear but the main C emission line was also exhibiting blooming.

The trouble is the CCD capture software automatically stretches the image and undesirable features such a blooming spikes are lost in the image.
What I need to do in the future is to take test images of spectra and measure the pixel count in the emission lines to ensure I am in the 30-50% operating range for the CCD.

It's all part of the learning experience for me.

Steven
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