Fitting the ViviCam 3826 with a stop between the lens and the CCD dealt with the overexposure.
The stop's diameter is 1 cm. With the subjects lit by 60 watts of incandescent, the pictures seemed well lit. I haven't had a chance to use it in full sunlight yet, but I suspect I may need to go smaller yet - perhaps 0.25 cm or smaller. But seeing as most of my work is done indoors, the sensativity suits me fine.
The most critical part of this project has been the spacing between the manual lens and the CCD. Trial and error in lieu of learning any optical theory...and further refinement seems probable.
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