Quote Originally Posted by jdef
Can the SLR/LSLR be measured with a spotmeter? Further, if SBR exists only in the scene, how is it derived from a curve? If the value found by Davis' SBR calculation is not truly SBR or SLR/LSLR, what is it/should it be called?
Of course subject luminance range can be measured with a spotmeter. In fact, you can only assume the range with an incident meter. There's an interesting paper by Jack Dunn entitled Expose for the Middle where he talks about how an incident meter is perfect for the criteria of the transparency.

When you are talking about the curve you are talking about the range of exposure (H) usually referred to as log-H range or sometimes LHR. LSLR basically becomes the log-H range in the camera. Your right in thinking that the two are associated with each other.