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Old 07-03-2010, 07:36 AM
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Tandum (Robin)
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Join Date: Apr 2008
Location: Wynnum West, Brisbane.
Posts: 4,161
You'll need to set gain/offset before doing anything including darks. Easy to do, just make sure no light is getting in. If you are doing this in the daytime, get some alfoil, fold it up and put it under the nose cap. Those plastic caps leak light and IR.

Get the camera cold and shoot some bias shots. Adjust offset to give an average on the hystogram around 1000. That's it. Now remove the cap and shoot some 5 second exposures of daylight. This will saturate all pixels on the sensor. Check the hystogram and adjust gain so it tops out up around 65K. That's it done and set forever. I have no idea why they don't do this in the factory.

Put the foil and cap back on and shoot your darks. If you change gain/offset for some reason, you'll want to redo the darks.
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