GT750 Thread, HDMI 1.4 Capable - Page 18

That is the idea, but someone who currently has a GT750 should probably double-check. I returned my 750 for a GT720 I was able to find for about 1/2 the price. Also don't 100% trust online TD calculators like Projector Central, they sometimes are off especially with short-throw projectors. Maybe the Optoma manual or website might have one to cross-check those numbers too?

Thanks mikemav,
Sounds like you got a good deal on the 720.

To the people that have seen the GT750 in action.
What do you feel the largest usable screen size is, before the image breaks down because of seeing pixels blown up too large or just the limit of 720P resolution ?
How Big Can You Go with the GT750...?
Is Bigger always better with this PJ for 3D, and at what point is too much, too much with this PJ ?

well it looks just fine at 135 inches. given that its short throw so remains fairly bright, I think you would be fine up to 180 inches.

Hi robl45,
I would like to go big and if I'm not overly picky about seeing pixel structure, I would love to know what you think is the minimum distance,I would need to be, from a 160" screen ?

Anyone think a 160" screen with 3D, is just pushing this projector too far ?

Hi there,

I just recently purchased a GT720, and it too, has developed dead pixels (after less than 50 hours of use). Mine was NOT a refurb, and seems to be a pretty common problem with this model. I'm looking at sending it back to Optoma for warranty repair, but wanted to know how you made out with yours?

They MUST be aware of this problem, and I would hope that whatever is causing this (defective/poorly designed DMD chip???) they have a proper fix for (a newer version/build of the defective part) and don't just "repair" it so it ends up having the same problems down the line.

This is really unfortunate because I love the projector... But I could never justify buying another Optoma knowing it will most likely fail.

It really depends on a host of factor, mostly how much pixelation you find you can accept and viewing distance.

Here's a link to viewing distance calculator which uses the smpte and thx recommended viewing angles.
http://myhometheater.homestead.com/v...alculator.html
I sit about 10 ft from 100-120inches. I can start to see pixels if I move in about a foot. I'd use a smaller size but with 2.35:1 movies it just looks too small.

3D will cut into the brightness quite a bit so it may be too dim at that size. Also calibrating the projector to have a more accurate greyscale will also cut a lot of brightness. Out of the box my unit had too much red and green in the greyscale and balancing it with the blue caused me to lose so much brightness that I had to change the projector settings to the normal mode (from the eco mode), then I had to play with settings to get the brightness up....the grey scale is not as accurate now but I felt the picture needed an increase in brightness and contrast which was not attainable when I calibrated the greyscale to be more proper.

Thank You so much for your time wyen78,
Just want to be clear about something.
Once you got the 3D picture tuned-in just right to your likeing. Was there still enough brightness left for a 120"diagonal screen in 3D mode, or was it too dim after tuning the picture to have a 120"diagonal screen in 3D mode ?
Would like to know your thought on, from a brightness standpoint, what is the largest (with good brightness) usable 3D screen, with this projector ?

When I had it tuned in to where it was as accurate as I could get it with my i1 display (I'm just a hobbyist not a pro and the meter is a budget one just FYI). It was not good for 3D and 2D with any ambient light was also not very good. I did like it in total darkness.

So I decided that it was okay to run out of blue at the higher ire and not have as accurate a greyscale in order to get more contrast and brightness.

I didn't calibrate with 3D settings, I didn't want to try to rig something up to get my meter behind a pair of glasses and then I'd need some kind of 3D calibration disc since I don't think the projector does 2D-3D conversion.

This projector will automatically go into it's 3D picture setting when 3D is active. I decided not to mess with it. I think it's fine for 120 and would probably be fine for 160.

Again, sorry to say, it depends The brighter the image, the worse the black level so it's really about finding out what's acceptable to you and what your priorities are.

You could also go for a higher gain screen (I'm just using a wall) to squeeze out more brightness.

This isn't a projector for the videophile who wants the best, it's not for the guy who spent 10K setting up a dedicated HT room. It's a perfect fit for those who don't want to spend a lot to get a 3D capable unit and who is willing to accept some picture inaccuracies to save money and still be able to get a huge screen.

If it's your first projector, I think you'd be pleased. I look at 60in tvs in stores now and wonder.....why are these things so little? The first time I played ps3 and the controller icon on the startup screen was bigger than the actual controller in my hand......

Great wyen78, Think I get it now.
Thank You for the help.

Anyone know where I can get an ir emitter for nvidia 3dtv on the cheap?

I plan to use the built in rf glasses for 3d gaming when my new gtx680 arrives. Will this planned setup work?

Thanks!

Anyone have a preferred picture setting they use, I know everyone is different with room layout etc just curious to what settings other uses are using ie contrast brightness colour gain/bias thanks

I plan on installing this projector in my basement and use it occasionally for movies (using PS3), Sports and TV Shows (using cable TV Verizon FIOS) and Games using (PS3, XBox)

Questions from a new Projector buyer before I make this purchase

1. Does this support cable TV 3D format? Can I hook this up with FIOS cable box and view broadcast 3D programs/games?
2. The specs say this is "short-throw". I read somewhere that installing this short might cause distortions. Can I install this "normally" at 10-14 feet and get good image quality or this **has** to be installed within 5-7 feet?

Ha, at 10-14 feet you are looking at a 200" screen, not sure if you'd have the space for that.

I'm at approximately 6/7 feet, and I've got 120".

I don't notice any distortion from the Short Throw, although some of the edges of the screen are SLIGHTLY, and when I say slightly, I mean nobody would ever notice, blurred.

I'm really happy with the quality of this projector, except mine is going in for repairs, due to a bad DMD chip (dead pixels), which seems to be a pretty common problem.

Thanks! So its not possible to reduce image size to around 100-120 from 10-14 feet away?

No, there is no zoom on the short throw lens, and no optional lens with this model. You may want to look into an Acer Hd5360BD (or Optoma HD33, to step up to 1080p 3D.) Both have longer throw zoom lenses.

Thinking about buying this projector. What is the VESA port on the back of the projector used for? I have a Mitsubishi TV with an external IR emitter that I plug into the VESA port on the TV. If I plug this into the port on the back of the Projector could I use the glasses work with that emitter?

Update: I guess the VESA port is an input not an output. I have another idea though. I do have a 3DC-1000 that accepts any 3D signal and outputs the format in the checkerboard format. What's nice is that it also has an Emitter Output for glasses. Does anyone know if the GT750 accepts and displays the checkerboard format. Since it is a DLP I would think it would but wanted to make sure.

2nd Update: Looking at Optoma's website and user manual it looks like the VESA port is an output. Can anyone confirm? It also looks like the GT750 does accept checkerboard format.

The port is to plug in the RF emitter to send the RF signals to the RF glasses.

Hi guys,
I have an HTPC with HD5870 GPU on a board.
Could someone tell me, will I able to watch 3D MKV (or BD 3D) SBS/ Top-Bottom on this projector using HDMI 1.3b cable?

Thanks in advance for reply’s,

Ata
Edited by Atahon - 6/11/12 at 9:19pm

I am having a new problem. When I turn my projector off, it turns right back on. This has started happening the last 3 uses. I have tried turning it off manually, original remote, and my logitech remote. All same results, turns off, then turns right back on. I have to unplug it to keep from running all night. Any ideas or anyone experiencing this?

frunko1 I had the same issue. drove me nuts... go into the menu > Options > Advanced > Direct Power On > turn this to "ON".

That had fixed my issue with the projector not turning off and turning right back on...

Good luck hope it works for you!

-Dave

since i bought this projector on september 2011, im having this problem...when i plug in the xbox 360 or the Sky Mexico signals through hdmi...the projector shows in the lower right area a 2160 x 1920 resolution or 1280 x 720 resolution, the problem is this, the picture quality is so-so, and when i access the projector picture menu, the color saturation and the tint options do not appear, i have checked everything and nothing make them appear...its like the projector is receiving data signal or computer stuff or something like that, i dont know..., i know there is a problem, because i used to have Directv, and when i plug in the hdmi using this system device, the lower right corner showed 1080i or 720p resolution, the picture quality was good and the options i said before appeared in the picture menu.

Just in case you have doubts about the devices (Sky Mexico and the xbox 360), i have the Optoma HD20 too and when i plug in those signals through hdmi, this projector works great, 1080i, 1080p and/or 720p...

I dont know whats wrong with my Optoma GT750 projector, but it has been driving me crazy!!!

If someone has experienced anything like this or have an opinion or hint how to get it right, please let me know guys.

Thanks in advance.

Would it have to be a RF emitter? I would think it wouldn't matter if the emitter was IR or RF as long as the emitter plugged into the VESA port.

Hey there,

I just thought I'd share, since I was in the same boat, except I didn't know about the BENQ W710ST before I purchased my Optoma GT720 (pretty much the same as the GT750).

So, as I mentioned, I'm a Optoma GT720 owner, which, in my opinion, has awesome quality, super bright, great colors, but suffers a bit in the darker areas, and blacks aren't superb, but this is pretty common for projectors, especially sub 2000$ ones.

Pros : Brightness, colors, image, Price
Cons : Blacks, no 1080p, Slight motion lag, Rainbows, NO ZOOM

Now, I didn't know about the BENQ 710ST when I purchased, otherwise I would have gotten it... here's why.

BENQ makes awesome movie projectors, and this is based on a popular successful model, and I'm sure it compares favorably to the Optoma GT 720/750 and matching it closely, or exceeding it in some areas, but it has ZOOM... something I would have killed for, for setting up, but also when watching 2.35:1 movies.

I have a limitation in screen size due to height (Bulkhead/Ductwork) and this would have allowed me to get the max image size for my 16:9, while also Zooming in when watching 2.35:1 aspect ratio films.

All in all, I say they are PROBABLY similar in quality, but the zoom is a HUGE plus. HUGE.

P.S. Optoma GT series are also notorious for bad DMD chips, I had to send mine in for repairs after 50 hours of use (hundreds of stuck/dead pixels), which started showing up only 10 hours of use. And although I had the projector back at my home less than 1 week after SHIPPING it (awesome service), it's still something to consider.

Hope this helps, I know it would have helped me tremendously.

I don't think the benq 710st has hdmi 1.4 ports, I believe they are 1.3 so no 3D bluray without a converter box which adds 2-300 bucks to the cost.

Yeah I was thinking about this after I posted.

Apparently 3D isn't fantastic in 720p anyways, but some people claim it does it well (the GT750).

For me, 3D wasn't an issue, but if 3D if of importance, then the Optoma GT750 is definitely a better bet.

Anyone tried this projector with AMD's HD3D? I would love to also be able to play computer games in 3D on this. AMD uses TriDef 3D, which according to TriDef's web site:

" is compatible with the latest Microsoft operating systems and most types of 3D display, including passive polarized, active shutter and glasses-free. Also compatible with Intel® HD Graphics, AMD HD3D Technology and NVIDIA® GeForce® graphics."

been a long time since I posted here, been busy watching movies on the projector. couple things I've noticed. Lately the damn thing doesn't want to go into standby mode, the standby light is always flashing green, as far as I know it should only flash green during shut down and startup while its warming up cooling off, anyone else have this? it flashed all last night.

When hooked up to the uverse box, screen is fine, when I hook up to computer, and use the dimmer lamp setting, you can see the screen look like there is a candle in front of it. its dimming and brightening like that. when I put it to bright, it seems to be better. I been using the same computer with gt430 video card for quite awhile now.

Got my GT750 in Saturday. I managed to snag an open box from Best Buy for $650. It's the GT750 not the GT750e so it came with a free pair of RF glasses. The lamp had 20 hours on it, so overall I think it was a decent deal.

Pros:
Gaming and movie wise it's really nice. Black Ops in 3D looks pretty nice. Tron Legacy 3D was amazing looking. I can't say much for the internal speaker, I have it disabled, I'm using a Sony 5.1 system. I had no issues with playing 3D both on the PS3 and on my computer. When not in 3D mode the projector seems to do 1920x1080 @ 60hertz just fine, even though it's not officially a 1080 projector.

Cons:
It's not as short-throw as I was expecting. The front of the projector is almost exactly 7 feet from the screen to get a 103" diagonal screen. At 103" if you're less then 4 feet from the screen you can see thousands of these little squares. They are not visible beyond 4 feet or so and I have no idea why you would be sitting closer then 4 feet on a 103" screen, but they are definitely there. When viewing data (like surfing the web or using Microsoft Word) the screen looks like crap. The letters are kinda blocky and, even though I have the resolution set to 1920x1080, it's too tall for my screen (this may be because I'm a newb and need to adjust the settings in AMD's catalyst control center). I'll update this after I have more time to play around with it.

3D on the PC:
3D on the PC was actually pretty simple. I have AMD 6000 series video cards (crossfired) and running driver version 8.951.0.0. All I had to do was install a third party 3D application recommended by AMD, it's called TriDef. TriDef found my games automatically. World of Warcraft and Skyrim both looked amazing in 3D. I also had the TriDef program play a non-3d movie in 3D and it surprisingly looked pretty good. Disclaimer: My computer is not your average computer. I'm a computer geek. I'm running an overclocked quad core computer with dual SSD's, crossfired video cards, a nice big Zalman aftermarket CPU heatsink, 16GB of DDR3-1600 memory, and bunch of other goodies. 3D performance will probably vary depending on the computer.

Misc:
I don't get my HD cable box until this afternoon. I'll update how it does on TV and sports tomorrow. I have some DLP-link glasses that should be arriving Wednesday. I'll update this with an RF vs DLP-Link after I try them out.

Current Setup:
Optoma GT750
103" BOC screen with 3" black felt border
Phat 80GB PS3 with latest software update
Optoma RF 3D Glasses
Sony 5.1 Dolby Surround Sound

Sounds like you should be able to go closer for your screen. I'm at 7 feet with 135 16:9 screen