Expected exposure: The expected exposure should be approximately the same value as the exposure in the imager or 0 to ignore this setting. The default is 0. It's used by adaptive sampling to determine which pixels are bright and which are dark, which obviously depends on the exposure setting in the imaging settings.
If set to something not 0, adaptive sampling tweaks/reduces the noise estimate of very dark areas of the image. It also increases the min. adaptive samples limit for very dark areas which tend to find paths to light sources only very irregularly and thus have a too optimistic noise estimate.
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