2018 Sony Master Series LCD Calibration Thread
Something that should be discussed clearly is that Sony sets the black level of the tv. Neither the metered readings of black level or the calibration of the display changes the lowest black level of the tv. Calman does nothing with the calibration of “black”.
The black level can be increased however and we’ve demonstrated that it can happen in error.
I believe the SDR black level floor is approx .051 @ 108nits or .056 @ 138 nits. We’ve seen those black level readings increase almost 25-30% because of an error in either the HDMI stream at 1080 or the displays handling of 1080 (perhaps something else but it appears to be one of those 2)
The reported contrast ratio in Calman is approx 2450/1 @ 120 nit target. Looking back at various calibrations I’ve done, both my black level and contrast ratio as a result have varied to as low as 1650/1.
If you have the ability, do your calibrations at 4k and don’t do any resolution switching to 1080. Initialize your HDMI connection after setting up at 4k. If you are seeing .08 blacks, something is wrong. The tv can do better. This error increases readings up to the 30% pattern and this is the reason we should try to get black to generate correctly. Remember, Calman doesn’t impact black but a raised black is an indicator of raised steps in the grayscale up to 30%. The steps starting at 4.6 (in 20pt) are impacted by autocal.
What’s the impact of this? I’m not 100% I can explain that in terms of PQ but logic tells you that a calibration done with elevated blacks and shadows is not going to be correct. Does the tv elevate black with normal content?? Not sure but an incorrect calibration applied to to a stream with normal blacks isn’t going to be correct either.
I’ve eliminated any 1080p being fed to the display as a precaution.
I think my 75 Z9F looks better than ever after dialing this in. I’m being careful with this analysis and statement. I’m 100% that it’s true.
Sent from my iPad using Tapatalk
Last edited by thomasfxlt; 07-28-2019 at 10:51 AM.