I doubt the secondary sensor in a DSLR has better light gathering capability than the main ccd in our compacts, yet DSLRs don't stop metering at night.
Graph: Are those the last 2 bits of the meter value ?
DSLRs don't have the luxury of being able to use the main sensor for metering...
In any case, from the graph it appears that the readings are reliable (consistent) down to -800, but that the camera unfortunately rounds them off brutally.
I can't imagine that the sensor itself does any rounding off/clipping; it should hand over the raw photon counts
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