Probably a dumb question… but why is Smart Offset disabled for HyD detectors? If zero values are not good for PMTs, then why are they allowed for HyDs?
The bottom half of the HyD is solid state and does not leak current like a PMT circuit does. The need for PMT offset is to delete this current, so you only record signal changes due to the arrival of light. Since HyD detectors have a fixed and steady zero, no offset correction is needed.
I must say that I would have preferred that HyD detectors started at 1 instead of zero, as the sea of green can be distracting compared to a black background, when using the QLUT feature. Leica could easily do this on all-HyD systems with a simple substitution of color palette. But in mixed systems, you need to see how much zero you are getting when tweaking the PMT offsets.
Thanks for your reply!