Originally Posted by Ian_Currie
I'm guessing 1130:1 ansi is with DB on.
I doubt it matters, or is very little difference. The iris is probably open for the ANSI CR pattern either way. That pattern is a very bright pattern. With that much 100 IRE stuff in the image it wouldn't make sense for the dynamic system to clamp the iris down.
Originally Posted by odyssey
However, MTF at higher frequencies correlates well with ANSI CR in DLP, LCOS, and CRT projector designs. It would be very unusual for a projector to have better MTF than another projector at low frequencies and not maintain that advantage at higher frequencies that are within its limiting resolution.
I measured the center 4 boxes from a Samsung A800B at 127:1 the other day (after pretty much eliminating the room), yet with a resolution pattern of small amounts of white on black there was little to no chromatic aberration, even in one of the far corners I was checking out. It was very sharp at the pixel level. I'm guessing this thing would have higher MTF at full resolution than the Sony VW80, even though the VW80 had more ANSI CR than it (I measured the VW80 at about 400:1 ANSI CR and on the ANSI CR pattern the VW80 looked like it had brighter whites and darker blacks than this DLP). Unfortunately I didn't get a chance to compare real material between the two or really check things out on that front (we were testing temporal resolution kinds of things with the dark frame insertion, etc.).
Even misconvergence between the panels with a 3 chipper will hurt MTF for white at full resolution, but should have little to no effect on ANSI CR. And LCOS (at least the DILA version) seems to have its own issues with single pixel things like a 1x1 checkerboard that likely have little to do with the ANSI CR pattern.
I can't recall a case of such low ANSI CR, yet single pixel things that made it look like the lens was very high quality. I think there does tend to be quite a bit of correlation, but there are likely exceptions and this A800B would be an interesting one to investigate further. I'm hoping to get to see another A800B and check its ANSI CR, then maybe do some comparisons with content, or get a chance to view this A800B some more.
I know LCD wasn't mentioned, but the Panasonic AE3000 has been measured with pretty good ANSI CR (I believe 300:1 to 400:1 depending on mode and who is measuring) and I'm not sure that means it has MFT at full resolution that is relatively as good. Although it might be high compared to CRT.