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QSI will do a 640 with a colour sensor.
There is also a new SBIG 8050 OSC - it's apparently LRGB, not RGGB, so it should have better sensitivity than the usual OSC. However, when I asked SBIG for some sample images they said drivers were a bit thin on the ground, and field testing wasn't complete! Might be interesting in the long term nonetheless.
DT
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