Hi Malcolm,
I think you need to turn down the gain or exposure rate as your explanation suggests that the image is being over exposed and that is exactly what it would look like.
I find it's a juggle between setting the gain and setting the exposure.
You want the frame rate to be as high as you can, set the exposure so you can see the object but don't let it over expose, it should look a little dull. Exposure settings often change in steps rather than linear. Then adjust your gain a little to get what you want. It's trial and error but with a little experimentation, you'll get there! Do a test, then look at your final result on the computer, if not quite right, make small adjustments on only one setting at a time.
Cheers,
Damien.
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