when using the black clipping pattern from AVSHD disc bar 17 should be flashing and
evreything below 16 should be dark to set brightness correctly.
But bar 17 flashing becomes relative when using SUB-BRT in the service-menu of the VT50.
With SUB-BRT I can fine tune the brightness very well, from a few pixels flashing
(5-6 per square-inch) up to complete bar 17 flashing, about 15 steps in-between.
I'm wondering what would be the right setting?