Optoma gt760a

[Psw757]

Maybe someone can help me figure something out. The calc site isn't working at the moment on my PC.

I settled on the gt760a and will have a 8'5"h x 8' w screen and will utilize 4:3. I'm also using a custom floor box for it.

How far from screen do I need to be with projector to optimally fill the screen?

Thanks for the help!

[TheCoupe]

5ft 6" should do about right

[bionicboogerboy]

Hi Psw

Your throw ratio on that projector is .52. It is kind of hard to help you because you are using a 4:3 aspect ratio but your screen dimensions are not 4:3. You must first decide on the size of your screen. Using 4:3, if you are using your 8 foot width the image will only produce a 6 foot high image. If you are using your 8'5" height with a 4:3 aspect ratio your image will be about 11'3" wide.

Once you have decided on your screen size, you multiply your width by 1.25 and that will give you your diagonal. Then you multiply that by your throw ratio which is .52 to get a "guideline" of the distance the projector will be placed.

Note that projectors are not meant to be placed on the floor. Throw distances are calculated by assuming that they will be on table tops or ceilings. Once you place a projector on the floor, you have to negative keystone it and that shrinks down your screen size causing you to move it further away to fill the screen.

Also, the CPU you are using will affect image size. Different graphics cards will display images in different sizes.

Hope this helps

[Godfather]

Good choice. Happy with mine. It will be close as mentioned. I did 4:3 from the ceiling and it ended up being a little closer than I had calculated.

[Psw757]

Hi Psw

Your throw ratio on that projector is .52. It is kind of hard to help you because you are using a 4:3 aspect ratio but your screen dimensions are not 4:3. You must first decide on the size of your screen. Using 4:3, if you are using your 8 foot width the image will only produce a 6 foot high image. If you are using your 8'5" height with a 4:3 aspect ratio your image will be about 11'3" wide.

Once you have decided on your screen size, you multiply your width by 1.25 and that will give you your diagonal. Then you multiply that by your throw ratio which is .52 to get a "guideline" of the distance the projector will be placed.

Note that projectors are not meant to be placed on the floor. Throw distances are calculated by assuming that they will be on table tops or ceilings. Once you place a projector on the floor, you have to negative keystone it and that shrinks down your screen size causing you to move it further away to fill the screen.

Also, the CPU you are using will affect image size. Different graphics cards will display images in different sizes.

Hope this helps

Sort of helps, I'm new to projectors.

At the moment the screen will definitely be no bigger than 8.5h x 8w as the enclosure is 9h x 8.5 w. I could however hangs the build stretch it a bit to a screen 8.5-9w and still have a height of 8.5 if this makes a big difference.

I guess I'm trying to determine what ratio will give me the most screen fill. 4:3,16:9,16:10.

Graphics card is a 970m

The floor box is a terra hd box that has a ramp for the projector in it where I believe it is angled do you don't need to use the keystone. I haven't received it yet but that is how I understand it.

Thanks

[aja]

Best bet is to buy a projector that you can return because there are subtle variations that you can only discover trying them out. If one projector isn't suitable, exchange it for another one.

However, rest assured that you will have to use 'keystoning' to adjust your image, especially if your mounting position is at an angle.

Think of it this way, if your image is at an angle, in your case, bottom much closer that the top, the projector has no point where to actually focus the image. Keystoning involves digitally fooling the projector into thinking the bottom part and the top part of the image are at equal distances from the lens, when in actual fact they are not.

A good resource is here: http://www.projectorcentral.com/clas...correction.htm

[goatbarn]

You're screen is almost square. The most square ratio is 4:3.

[Psw757]

You're screen is almost square. The most square ratio is 4:3.

I am having issues with the projector central calc.

I'm having my screen made and was just trying to determine what size would work best within my space constraints.

[goatbarn]

I guess I'm confused then. Looks like someone above got the throw distance number (how far from screen), for a 4:3 ratio to fill your screen as much as possible with that specific projector. Idk what else there is to know...

Your screen will be filled if it meets any of the ratios...meaning you have 8x6 or 10x7.5...ie the ratio is exactly 4:3. Same concept on the other ratios.

I have no experience with floor projectors but what bionic says seems to make sense. Maybe floor projectors are specifically setup with negative keystone ability? If this is just a regular projector not necessarily meant for the floor maybe it won't work...

If you flexible with a few feet of how far from the screen you are...then just make your screen as close to one of those ratios as you can...I said 4:3 because it looks like your very close to a square screen size.

[Psw757]

Here is where I'm a little confused.

If I can get the screen to 9w and 8.5h, are there ways of utilizing zoom function or different resolution settings like 1600x1200 to get a slightly different size picture?

I think the 760a shows a zoom of 0.8~2.0.

[Godfather]

Here is where I'm a little confused.

If I can get the screen to 9w and 8.5h, are there ways of utilizing zoom function or different resolution settings like 1600x1200 to get a slightly different size picture?

I think the 760a shows a zoom of 0.8~2.0.

Zoom was limited in my experience setting it up. Your best bet is to get it all hooked up with the software and desired settings and then place the projector.

[Psw757]

Finally have everything setup

For those of you running this projector, what settings are you running for picture, brightness, contrast etc...

I'm pretty happy with it so far.

Tgc seems a little on the dim side but I tried Netflix and that was plenty bright so not quite sure if there is an adjustment within the tgc program or if it needs to be done on the projector menu.

Thanks

[Psw757]

Question for you all,

If the projector has a native 1280x720 and I'm running in 4:3, do I need to change the resolution anywhere else other than at the launch of game? Wasn't sure if I need to adjust display on my laptop under the control panel as well prior to launching game.

Thanks