Originally Posted by elasticcow
We recently purchased the Optoma GT750e and were overcome with the rainbow effect while watching Tron. I had to send it back because my eyes kept trying to lock onto the rainbows. My wife had the same issue.
We are thinking about stepping up to the HD3300 from AVScience, but I am now concerned that rainbows my be present there as well. I'd like to try to avoid another return scenario if I can. Can anyone who is rainbow sensitive confirm that the HD33 almost eliminates them?
I don't have the HD33, but I do have the HD20 which is basically considered the 2D version of the HD33. A big difference between the HD33/20 and the GT750e is the brightness. I don't know what the wheel speed is in the GT570e, but the 3000 lumens versus 1700/1800 of the HD33 / HD20, is a huge jump.
I also had the HD70 (720p) before the HD20, which was much lower 1000 lumens.
But even with the low 1000 Lumens, with the wrong settings, I could also push that to show rainbows. I too am sensitive to rainbows.
I have found a few things that exaggerate rainbows for me.
1. Distance to screen. If I am closer than 1x from the screen where it requires my eyes to do a lot of left/right travel. If your head has to move, even worse.
2. Can't remember the settings now, but there were some specific settings on the HD70 and HD20 that increased the digital noise and also made the rainbows worse for me at any distance.
3. Source content. Obviously ultra high contrast of bright objects against black scenes moving fast left/right will almost always cause rainbows for me on any 4x speed projector. But I don't know what speed the GT705e is. The HD33 is supposedly 6x (3x plus the high frame rate). But I don't know if the 6x figure is only for 2D viewing.
In the end, I sit further back and have adjusted the settings where my current HD20 does not have any rainbows 99% of the time. I generally have to have some extreme left/right movements in very rare scenes and look hard for them.
If I end up getting the HD33, I am hoping for the same or better performance in every way.
I am wondering if the GT705e is a 2x wheel speed given that in the past, bright (2500+) "gaming" or "business" projectors that don't list wheel speed; have almost always ending up being outed as 2x wheel speeds. But that is pure speculation on my part for the GT705e.