I found this in the thread. I've also heard that the DAY/NIGHT modes are buggy...whatever that means I haven't tried it so do this at your own risk:
ENABLE Day/Night modes:
It's only safe if you know exactly what you are doing. Merely right clicking on an item can trigger a chain of events that might brick your TV.
1. Start with the TV OFF. Press mute, 1, 8, 2, Power fairly rapidly. The TV will power on to the last input and in a few seconds the service menu will appear.
2. Don't do anything other than follow these instructions.
3. Arrow down to Expert and press Enter
4. Select N/D ADJ with up/down arrow key and right click to ON
5. Press the Return key
6. Select Source and either right or left arrow to ALL
7. Press the Return key twice
8. Power OFF
9. Power ON and select Cal-Day Mode. Turn off all the auto or dynamic crap in both Advanced Settings and Picture Options. They are garbage and will only work against you.
10. Calibrate to your heart's content. Any setting you select will transfer to all inputs so you only have to enter once. The factory Modes, Dynamic, Standard, Natural, and Movie will remain unmolested
Quote:
Originally Posted by
TiVoHD 
If so, nobody has figured out how.
Quote:
Originally Posted by
SiGGy 
So can ISF night and day cal be enabled on the D8000?
Are there any caveats?