Originally Posted by curtishd
What is your current set up? How significant is the ghosting with polarized glasses (linear and circular)?
I only have linear polarised. I haven't tried circular myself but all the people who did, reported significantly more ghosting than linear for very little benefits and switched back to linear.
Circular is used by RealD because they have special copies of movies with ghost busting pre processing, which I don't have.
I have two Epsons EH TW3500 (euro version of the Epson 8100), the primary colours are cross polarised, some are polarised vertically, some horizontally. Silverscreen is 106" diagonal 16:9 Harkness Spectral 240.
At first i used traditional polarising filters at 45/135° to get balanced colours. Colour uniformity wasn't perfect, in one eye : greens were prominent on the left and the other combined primary colours (purple) are dominant on the right. In the other eye the dominant colours exchange sides. The brightness is slightly more than the Omega filters but not by much.
Then I got specialised polarising filters Advisol SPAR designed to leverage this special polarisation and put all the primary colours at the same angle while keeping a maximum amount of light. It makes the picture very bright, almost as bright as in 2D mode (the label says 80% transmission, but due to the non linearity of perceived light, I feel it's like 90% transmission). Colour uniformity is better but not perfect, this time the greens are dominating at the center and purple at the edges, the dominating colours are in the same locations in both eyes and in lesser amount.
In both cases, crosstalk is about the same. The majority of which is due to the screen (silverscreens are the weakest link at keeping polarisation) It's definitely there but in small amount, and because it's proportional to light intensity, in actual usage, you'll only see it when you have super strong contrasts in a scene of super bright areas right next to dark areas. As soon as the scene is properly lit, the ghosting fades into the picture and you don't see it at all. 3D Movie directors know about crosstalk problems at cinemas (RealD) and do a lot of work to avoid to do scenes that might cause crosstalk problems, and whenever they have sharp contrasts, it's usually located in a place near the focal plane with very little separation so seeing crosstalk in movies is quite a rare occurrence. Games are a different beast and tend to have crosstalk issues, some games more than others. First person games tend to be the worse offenders.
I tried the Omega system this spring. At first there was only one version (the DLP set).
On my LCD projectors there was a strong colour hue difference between the eyes, and across the entire picture, and many primary and secondary colours were very difficult on the eyes : not only were the colour hues different but their intensity as well. Using the projectors colour settings, I struggled to equalise the colour intensity and brought some of the the colours slightly closer to each other. I couldn't go as far as a wanted to because I reached the maximum amount of colour tweaking the projector allows, many hue controls had very little effect since the filters affect colour frequencies, the colour settings cannot compensate RGB with colours that don't exist anymore. In one eye, Reds are dark orange, Greens are yellow-ish and Cyan is light grey.
Following some testing Omega produced the special LCD version which I still have and sometimes use. The colours couldn't be really fixed, but the light intensity is almost balanced between the eyes with the default colour settings, the picture doesn't hurt the eyes but the hues are still off. I could tweak more easily and bring the colours closer but the final result still has a lot of difference between the eyes. The picture is watchable but whenever colourful content shows up I can't help but notice the colours are wrong.
Regarding colour uniformity across the picture, it's acceptable but not perfect, my throw ratio is a little bit low (1.5:1), but that works both for the Omega system and the polarised system.
The one strong point of Omega is crosstalk. While watching the picture, there is none. You can force some crosstalk if you look through the glasses sideways by turning your head away from the screen and looking in the corner of the lenses, but you don't do that i normal watching.
An other difference is how the filters work. Polarising filters are absorption filters, Omega filters are reflective filters. This means that you'll see the reflection of your eyes in the glasses if there's any amount of ambient light, you have to use the Omega glasses in complete darkness, and artificial lights have spiky spectrums so they'll produce different colours in each eye (CFL and LEDs) Incandescents should be better but I no longer have them in my living room, and they produce too much reflections anyways. In comparisons, polarised glasses deal with ambient light very well, and i can use my little directional lights to create a nice controlled ambient lighting without destroying the 3D expecience if needed..Edited by BlackShark - 11/25/12 at 2:46pm