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Dear Sir:

L* is not in a raw file, it is a matter of interpretation in your raw converter, each will do (slightly) differently. When shooting a target, it is better to use RawDigger for evaluation. Make sure you have 0.3 to 0.5 EV between clipping and the white patch. To know the clipping point, you can shoot a specular highlight on a curved shiny surface, like a ball. Set the exposure in such a way that the highlight is small (check the green channel in RawDigger to see the size of the highlight), and the raw values on the highlight in the green channel will provide the clipping point.