CurtPalme.com Home Theater Forum

freidich · Posted: Thu Dec 20, 2012 1:38 am Post subject: What to do with 2 NEC XG1351LC

So I now have 2 NEC XG1351LC's and am not really sure what to do next. I'm considering doing a stack, or polarized 3d, and or just using 1 and keeping the other for parts, or selling parts if the demand/price is right. What are your thoughts on the matter, what would you do? [/quote]

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Polorized 3d sounds like a fun project.

then try stack or Blend.

nashou

Zolzar · Joined: 26 Jun 2009 Posts: 252

2nd that. Polarized 3d.

freidich · Posted: Thu Dec 20, 2012 3:18 am Post subject:

And all I need is polarizing filters and a computer with nvidia 3d + 2 vga outputs? And how do I set it up and converge the images? And what are the differences between stack and blend? Thanks guys, your help is greatly appreciated.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

https://www.curtpalme.com/forum_archived/viewtopic.php@t=18406.html

freidich · Posted: Thu Dec 20, 2012 5:56 am Post subject:

ok so i now understand the difference between blend and stack, but correct me if i'm wrong, polarized 3d would be a blend, since each projector displays the same image directly on top of each other, right?

freidich · Posted: Thu Dec 20, 2012 5:57 am Post subject:

also, side question, is there a quick way to zero out settings for calibration? and do you need to zero out the point convergence settings, or does that happen automatically when other, less precise settings are changed, (i.e. static convergence, tilt, bow, etc.)?

freidich · Posted: Thu Dec 20, 2012 5:58 am Post subject:

sorry for all the questions, but i promise to repay you all with some awesome screenshots when its all set up!!

**AnalogRocks** · Posted: Thu Dec 20, 2012 6:16 am Post subject:

freidich · Posted: Thu Dec 20, 2012 7:05 am Post subject:

lol i must be way too tired, i was literally thinking stack and somehow typed blend, thanks for helping me out!

freidich · Posted: Thu Dec 20, 2012 7:06 am Post subject:

Also, are you supposed to offset the images, or should it be identical to a properly configured stack, just with filters added?

barclay66 · Posted: Thu Dec 20, 2012 10:22 am Post subject:

Hi,

No offset. Both images have to be exactly on the same spot. Of course You'll have to align everything using an identical image for PJ1 and PJ2 (=2D mode).
This is a simplified setup procedure:

- Mount both PJs close together (side by side or top/bottom)
- Let them run for approx. 30 minutes for warm-up
- Do a rough alignment of the tube angles (mechanical horizontal raster centering)
- Do a rough alignment of mechanical and electrical focus on both machines. Don't care for geometry and convergence at this point. You might combine that with scheimpflug adjustment or do that later
- Display a test grid (green only) and mechanically align the PJs to be centered on the screen and having the mid-point of the grid at the same spot
- Do a full geometry and convergence alignment for PJ1 (this is the reference PJ). You may as well tune focus and stigmators (if present) at this point
- Display a test grid (green only) and adjust geometry of PJ2 for best matching the grid displayed from PJ1
- Align red convergence of PJ2 onto the green grid displayed from PJ1
- Adjust green and blue convergence on PJ2
- Do the white balance adjustments on both PJs (if necessary)

Of course You might need to readjust geometry and/or convergence for several times...

Regards,
barclay66

janzy · Joined: 11 Sep 2006 Posts: 103 Location: Boston, Ma

Josh,
Do you have these set up in the same room I was in?
If so, can you still get in the room to sleep?

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

All NECs have full convergence control over all three colours. There isnt much you cant do with their convergence really... Except f### it up i spose...

Best way i can see to do it with NECs is do projector one complete, then turn on projector two, and use red from projector one as reference for green on projector 2. Dont try lining green up with green cause it wont be near as easy as lining green to red. Forget blue. Its not bright enough.

barclay66 · Posted: Fri Dec 21, 2012 12:00 pm Post subject:

hansilili · Joined: 09 Mar 2007 Posts: 302 Location: Köln, Germany

@freidich

I set up a 10PG stack in my basement for test purposes. Picture punch was awesome but the whole story had too many drawbacks for practical use so I gave up.

If you happen to live close to Dormagen, Germany, I'd be happy to come around and give you a hand with your stack.

Cheers

freidich · Posted: Fri Dec 21, 2012 10:16 pm Post subject:

@barclay : thanks so much for such a detailed explanation
@janzy : no, they are in my basement at home, there is much more space
@hansilili : thansk for the offer, but i am across the ocean

ElTopo · Joined: 07 Nov 2006 Posts: 1640

A stack should be much more difficult in comparison to a blend.

You really need absolute perfect focus and convergence on both projectors.

Go for the blend and have reserve for bandwidth.

ElTopo

Motobias · Posted: Mon Jan 07, 2013 8:18 pm Post subject:

if you don't want them...i'll take them Very Happy

noos@xp37+ · Joined: 17 Jun 2008 Posts: 464 Location: Berlin/Munich

1)...test patter for 3d dual screen calibration:
2)...dual output not via nvidia Geforce 3D vison. On Geforce only until Forceware 162.50 plus streo driver 162.50 and up to 7900GTX/7950GT no SLI and no 8-, 9-, 200-, 400-, 500-, 600 series g-force. But IZ3D or Tridef DDD driver can do the job on PC.
3)@Barclay 66: are you palnning or doing a dual 3d setup? I have a Barco DUET II here....