2 I'm removing the "low-budget" tag because I think that's just a distraction....
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Consumer Are there any consumer digital cameras with grayscale sensorsensors?

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Consumer digital cameras with grayscale sensor

Are there any consumer grade (i.e. not ridiculously expensive scientific equipment) digital cameras that use "grayscale" sensors instead of the prolific RGGB bayer filter? I figure that you'd get an extra stop or so of light if you weren't cutting out everything except the red/green/blue at each pixel. I've seen that some companies stock sensors by themselves but I'm not about to build my own camera from parts - though I wouldn't be averse to removing the bayer filter from a cheap enough camera.