CurtPalme.com Home Theater Forum

[416ray4538]

How much do the two projectors overlap.

[Tim in Phoenix]

Hello

For 16:9; twenty percent should work well. For 2.35, closer to ten percent. The blend overlap is adjustable in the processor(s), and the distance between the projectors can be varied to meet these situations. Blend is optimal for screen widths of nine to fourteen feet. A 1.0 screen fabric is highly recommended to avoid color shift problems.


.

[416ray4538]

So for a 9 ft wide screen 1 foot in the middle is shared?

[Tim in Phoenix]

[Nashou66]

[416ray4538]

Well I started out confused and now ...... It's not getting any easier. I had assumed that the pj should be centered in front of it's share of the screen. If they are mounted for a different overlap from what you are using what happens with the left and right outside edges?
What are you using to split the signal to each pj?

[Nashou66]

I first measure the hight of the screen then I use that number for a 4x3 screen. use basic algebra to find out the width . I then find the center of that "half" and set up the one PJ for that side(half). i then measure out the same width for the other side and set up the second PJ for that side. That will give you the % of the blend as well, if you stick with it. I do not have a even %, i dont think, but it is closer to 10%.

Let me find the TV-One blend guide On there Site.

here is a bled guide

http://tvone.CRMdesk.com/image.aspx?mode=file&id=285

Athanasios

[Boilermaker]

This is really not as daunting as it might first seem. Just think of it as a normal single projector setup that you are doing twice.

If you have the luxury of being able to temporarily move your first projector around, then just move the first one around until a 2.40 AR pattern fills the height of your 2.40 screen at the same time it fills your raster the way you want it to starting from one side of your screen. Making sure that this first projector is exactly centered within the image, measure the throw distance and the distance from the side of your screen and use those dimensions to place your second projector fromn the other side of the screen. If you use a 2.40 screen, you will find that the blend is very close to 10%.

To make setup simple, I used a cheap laser level on a tripod to set the two lines on my screen which represent the inside edge of each projector. These two vertical lines represent the outside edge of each of the projectors just as in a single projector setup.

What are you using to split the signal to each pj?

[Boilermaker]

Damn - How did I screw up the quotes on that post?! Must be too early in the morning - Hope it is readable.

[Tim in Phoenix]

So for a 20% you would have to have the PJ's physically closer? I ask because I use a 10% blend and tried 20% but with the PJ in the same location as the 10%. I found it made no difference.

Athanasios[/quote]


You don't "have" to do anything. The closer in to the screen, the more phosphor can be lit until you run off the edge of the tube. Some will run out of keystone range, or top/bottom focus range before they reach the optimal throw however. Nine inch lenses have an inherently slightly longer throw, and that makes nine inch machines more suitable. Also, too close in and the projector starts to block the viewer.



.

[416ray4538]

Is an Ampro 4600 a good candidate for a blend if I ca find a mate for it or would you lean toward something else.

[Nashou66]

Any PJ is a good candidate, if your ready to spend money on two Processors for color calibration and the VP to blend them and be ready for some major headaches that is.

Nashou

[Boilermaker]