I actually own this set. The red one that is. There is an ISF mode in the TV but the Movie mode gives the best gamma.
The CMS only half works so do not try to work miracles. There is no cms brightness control. The Saturation control does double duty as a brightness control too.
When you do grayscale … try not to increase any of the gain controls … only decrease. Increase means turning up the contrast which sends you into discoloration or clipping territory.
Still worth while to play in the ISF mode to get a feel for things.
For CMS … best you will get in in the range of 3 to 4 for some colors … others will get under 3 …
Regards
