Originally Posted by evnow
Everyone asking about rainbows - do you guys see rainbows on DLPs, in general. I'd guess, if you do, chances are you will see rainbows on 750 (or 33) as well - both 3D & 2D.
I never see rainbows (unless I specifically look for them) in any DLP projecor (this includes SVGA projectors made 10 years back).
I know. I don't know why I am reading so many questions regarding freakin' rainbows, especially if they never experienced it. It's nothing to worry about and you most likely won't even see them if you're watching a better than good quality video. It was my experience that lesser quality videos produced this effect more, but only when I darted my eyes back and forth. At first, I didn't even know what it was when I seen them. I thought it had do with me being tired or something else as it mainly happened late at night. It sort of reminded me of a kaleidoscope and I thought I was "trippin". I couldn't reproduce the effect at that time, but I later found out it was only visible (as other's have also said) during scenes with a darker background and lighter foreground, like credits and only when I darted my eyes back and forth really fast. The faster I moved my eyes, the more the rainbow effect. I compare the effect to one of those LED clocks that move so fast that you can see the time or date:
So basically, when the lighter colored object on a darker background moves rapidly across the screen, it'll leave somewhat of a "streak of colors", hence the rainbow effect. Or, if the lighter colored object is stationary and you move your eyes, then the same effect happens. But please note, I did not notice any RBE when watching 3D, only in 2D.
What I was really concerned about was the "screen door effect" I noticed on the older GT720. I had read that this was common on LCD PJ's as RBE was common on DLP, but the GT720 had very noticeable SDE. Sure, the further I sat back, the less noticeable, but I like to sit pretty close to the screen to get the full effect of a giant screen, but even at 11 feet back, I noticed those little squares, not so much during movies, but during light background scenes and when I had the computer desktop on screen.Screen door effect: