Originally Posted by mmoore2
There are just 2 small issues - the reds are very bright and overpowering - they practically shimmer at times. Looking back in this thread at a post with the spectral graphs, I can see where the LCD red spike is pretty tall compared to the DLP one, so maybe that's the cause. I haven't tried adjusting any settings yet, but I will. But it also sounds like I may be a good candidate for the corrected filters.
The other thing I noticed is that sometimes when there is some slight ghosting like with words on the screen, if I turn my head just a little bit away from where the words are, the ghosting goes away (the letters seem to re-converge). I'm quite sure my projectors are square with the screen, but maybe this indicates otherwise? Or is it something to do with the filters? Do they have to be exactly parallel? Has anyone else noticed this?
Since my projectors are close to yours (Epson EH TW3500 = Epson 8100), we should have very similar results.
My reds are not that strong but they are very different between the eyes, the left red eye is very bright but looks washed out while the right red eye is extremely saturated but very dark : producing eye rivalry, which I believe is what you seem to be describing as this shimmering effect.
I also have a similar issue issue with cyan : I get lots of rivalry in shots where you see the sky, my green depends on the colour mode, in dynamic and living room modes the right green eye is almost yellow, in the other modes the colour is better but the picture is way too dark.
Ghosting : I do get ghosting if I turn my head away from the screen : ghosting appears first in the corner of the glasses.
The ideal position of filters is perpendicular to the light path, that's where you get the best filtering and max brightness (regardless of the screen position)
If you use lens shift, then the filter should be slightly tilted according to how much shift you are using. If they are not perpendicular to the flow of light, you'll get crosstalk and serious colour problems.
On my projector which is on top of the stack, I am at max shift downwards and to the left (I hit the diagonal shift limit), but my filters are simply suspended and remain vertical (parallel to the screen). I don't see any ghosting on most of the picture but the bottom left corner of my screen (the size of my windows start menu) does leak a little (and is slightly too blue).
The problem with the optimal position (perpendicular to the flow of light) is that there is a significant amount of light reflected back into the projector (increased heat, possible reduced lifespan of the LCD panels and/or the fan must turn faster to keep them cool).
As a compromise, the filter should be very slightly off angle but not too much, just enough to make sure the reflected light doesn't hit back on the LCD panels.