Why would "relative" be useless ?.
Anything referencing a relative value is to a reference, which manufacturers state in their Data sheets, so i think you are confusing this with something else.
In fact all electrical component data specs have relative values stated and are given reference to what, including your supplier Sbig, e.g Dark current is relative to a temperature, so go tell SBIG there data is fairly useless. They'll send a firing squad over ...
All the Sony HAD and SuperHAD sensor data is available on the net, so im sure a little surfing can yield your answers. Many manufacturers are using the Sony sensor, so they may have it on their web already. But i'll keep an eye out for my copy, somewhere.
Theo
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