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I use the program Iris for capture as I have both a digital still and web cam , but basicaly you need to have the gain as low as possible. I have it so that the image is just visiable on the screen.
It depends on your scope and focal ratios used subject and does take a bit of fidling. If you can see a dim image that appears to have some contrasty features your on the way. If it appears to bright and washed out you need to make adjustments to get it dimmer.
My gain slidder is only a few millimeters to the right.
Mark
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