Originally Posted by mark haflich
After Ken's calibration, he got 7 plus foot lamberts of my 110" D 1.78 Studeotech. That's with the contrast set to 54! Black at 78....
......and turned the black up a bit to bring up crowd detail.
The black settings in your VP50 must be off for a brightness setting of 78 or more on that Marquee. Unless the VP50 works much different from any of the sources that I run on my lowly 8" Marquee. If you have the MP-5 in the loop, then you could end up with a slightly higher brightness setting, because of how it transcodes the component signal.
Below are a few shots I've taking from my 8" Marquee (1920x1080P /60hz - Xbox 360)
Contrast at 60, brightness (black) on the Marquee set at 50.
Look very close at the lighted areas in the backgrounds. It is equalized through-out the image, because you'll want both good contrast without clipping to include perfect light in darker areas of the background scenes. Though there are three different dark background images, the contrast and brightness settings were not changed for any of them. This is the 0 to 100IRE window I was talking about at the meet. Once that reference window is set with both contrast and brightness set at 50. The green G2 should not be moved (and there should be very little change with final brightness setting). Everything else around it can be adjusted, but don't touch the green G2. It would be your reference, and it should be setup using the internal step pattern.
With the mods, it's more important to use this reference, because the projector can go up a bit in gain setting without clipping (higher contrast). So proper reference is important for best dynamics and image punch within the IRE window.
The internal step pattern helps in setting up the video gain structure of the Marquee. And for the absolute best video gain structure setup overall, the processors (VP50) black level should be set using a scope. And that's why you have that pot on your VIM. It's there to help if the incoming pedestal is off a bit (and cannot be corrected with a black level control on the source).
For the absolute best in low end performance. The video chain gain structure should be setup using proper pedestal level setup from source to projector, to include proper step pattern setup in the projector. This produces the best path for a 0 to 100IRE window: