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I may be wrong, but I believe clamping refers to a diode clamp to stop saturation of the ADC.
Another thought is you can also get artifacts when focusing as you are exposing faster than the shutter can close. If you take flats with the qhy9 you'll see that anything less than 3 seconds will give artifacts from the shutter in the flat. So if you are focusing at a second or so, you will most likely get bloom lines running from a bright star as the shutter isn't completely closed as it's reading out. I see this a lot when focusing on a bright star in a sub frame image in maxim.
Last edited by Tandum; 07-12-2011 at 11:41 AM.
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