Originally Posted by limestone
I've been trying for half a day to get more information regarding this topic, but to no avail.
I read this on Optoma's website:
Why use a projector for 3D?
It is a widely accepted fact that the bigger the image, the greater the 3D effect - for the best results it is essential to fill your field of vision, without having to be too close to the screen. Even a huge 50” TV can only create a window on the 3D world, whereas the immersion & excitement created by a massive 150” projection screen makes you feel like you are part of the action!
So if I were to believe my anecdotal experience, I find that to get the best 3D depth effect, I need as large a screen as possible, coupled with being as far away from the screen as possible.
Is this correct? is there any information on the web that supports my theory?
A large screen makes objects look closer to life size, therefore giving more realism to the image. There is a sweet spot of distance from the screen that will give you the best 3D depth effect. If you move too far back, the 3D effect becomes somewhat stretched. Too close, and you get a flattened 3D effect plus crosstalk or overlap of Left and Right images in your shutterglasses. You will rarely find that you can get close enough to fill your field of vision. Plus you will loose sharpness and definition within the image. I have a 16:9 screen 159" diagonal, and I sit about 17 feet away and it's perfect. If I watch 3D movies that fill the whole screen, then I get a very immersive effect. If I watch 2.35:1 widescreen movies, then not as much.
Overall, I would agree that bigger is better, but you have to consider the brightness capability of the projector as well. For good 3D on a large screen, you need a projector that can do 2,300 or more lumens of brightness. But it's all subjective. You will find that sufficient brightness for 3D is the nemesis to getting a large screen and projector that will satisfy you. My projector is rated at 2,500 lumens and my screen gain is 2.4 times what a normal screen would be. However, I have a special screen that is hard to find, and most screens are going to be 1 to 1.2 gain, and that limits your size to about 120" for a bright image that is satisfying. It's always best to read the projector forums and find out what projectors and screens people are buying that are giving them a great 3D image.
If you are getting your first projector and want a big screen, then I would recommend the Optoma 142x, which has an excellent 3D picture and is rated at 3,000 lumens at a very reasonable price. Search Amazon. You can also get a 150" screen for reasonable--search that as well, and get one that has a high review rating.
Others on this forum will have their own opinions as to what is the perfect projector and screen, so be prepared for more confusion. The projector/screen I suggested costs around $1,000 and is a great way to get into large screen TV without chewing up your budget. If the screen turns out to be too big and not bright enough, you can always mask it to a smaller size with black velvet material you can get at most cloth stores.