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Hi Russell
Not knocking OSCs, they certainly have significant advantages. However, they do start out behind the 8 ball in sensitivity, since fewer than 1/3 of the photons falling on the chip actually make it through to the pixels - the rest are absorbed by the Bayer filters. For this reason, you will probably need to image a bit more than 3 times as long with an OSC to get the same luminance result as with an equivalent mono camera (luminance is synthesised in the case of the OSC). To add lower resolution colour data to the mono camera image, you will need to image maybe as long again (in RGB) as for luminance, so overall, the OSC will take about 1.5 times as long as an equivalent mono camera with LRGB filters for roughly the same result.
The situation is exacerbated if the OSC is uncooled, since thermal noise becomes a big issue if the signal levels are inherently low.
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