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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Who makes 40 Foot Screens for 4K?

T

Tim Whitcomb

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Stewart Film Screens?
Harkness?
Da-Lite?

None seem to carry screens that large. Unless they are event screens?

Anyone know where 40 Foot Diagonal Screens are made?

Questions questions... My concern is the screens will cost more than the projector.

What Gain recommended for Laser Projector?
 
Stewart makes seamless theater screens up to 40' by 90'. They are custom quoted and built to order in any format or size you want. Largest we have installed is a 12' x 30' for a multi- projector nuclear command and control setup. Cost was around $18 per square foot if I remember correctly. Harley is another major large theater screen manufacturer. Don't know much about them. We use Stewart for anything taller than about 10' image height, Draper for smaller screens.

If you are interested PM me with the image dimensions you want and I can get you a quote. We use their 1.3 gain material most of the time. Higher gains tend to hot spot and should only be used in high ambient light environments. Closer to matte white you stay the better the color rendition and image quality.

I assume you are thinking about Red's 4k projector. Be nice to know what the lumen rating is for your projector choice to insure it will meet or exceed SMPTE screen brightness standards for the screen size you are thinking about. Lasers and LED's are a bit problematic as the eye responds differently so the standard xenon or HID lamp calculations are not necessarily accurate.
 
David Rasberry said:
Stewart makes seamless theater screens up to 40' by 90'. They are custom quoted and built to order in any format or size you want. Largest we have installed is a 12' x 30' for a multi- projector nuclear command and control setup. Cost was around $18 per square foot if I remember correctly. Harley is another major large theater screen manufacturer. Don't know much about them. We use Stewart for anything taller than about 10' image height, Draper for smaller screens.

If you are interested PM me with the image dimensions you want and I can get you a quote. We use their 1.3 gain material most of the time. Higher gains tend to hot spot and should only be used in high ambient light environments. Closer to matte white you stay the better the color rendition and image quality.

I assume you are thinking about Red's 4k projector. Be nice to know what the lumen rating is for your projector choice to insure it will meet or exceed SMPTE screen brightness standards for the screen size you are thinking about. Lasers and LED's are a bit problematic as the eye responds differently so the standard xenon or HID lamp calculations are not necessarily accurate.
Click to expand...

Hi David- thanks for the detailed response! Ill send you a PM but also want to comment here as others will undoubtedly have some interest.

Yes, we plan on installing 2 Red laser Projectors... one for post and will use a smaller more readily available screen

The 40 Foot screen we would want for 4K screenings on our sound stage. Which can easily accommodate the large dimensions.

BOTH will be light controlled rooms so we would want minimal gain... especially in post for CC.

SInce there are no specs yet released... I imagine it will be difficult to make a determination as to what screen material is ideal at this time
 
Tim Whitcomb said:
Hi David- thanks for the detailed response! Ill send you a PM but also want to comment here as others will undoubtedly have some interest.

Yes, we plan on installing 2 Red laser Projectors... one for post and will use a smaller more readily available screen

The 40 Foot screen we would want for 4K screenings on our sound stage. Which can easily accommodate the large dimensions.

BOTH will be light controlled rooms so we would want minimal gain... especially in post for CC.

SInce there are no specs yet released... I imagine it will be difficult to make a determination as to what screen material is ideal at this time
Click to expand...

It is more about setting size limits rather than screen gain. Target for theatrical conditions is 16-20 foot Lamberts, though I like to spec for at least 30 FL to allow for lamp degradation. 40-50 FL for 3d. Basic calculation is to divide the projector rated lumen output less 10% reserve for calibration by the square footage area of the screen.
 
Interesting... ok so our space is 50 Feet Wide and has 30 Feet Ceilings. The Projector will be 65 to 75 Feet away give or take 5 feet.

How tall is a 40 Foot Diagonal Screen? Pythagorean Theorem for calculating diagonal (hypotenuse) is AxA + BxB = C
And determing width is a mutliple of .87... but I cant remember how to determine height...
 
Math

Math

Height and width numbers both depend on the aspect ratio you use. Assuming it's 16x9, y=1.78x.
And we know x[SUP]2[/SUP] + y[SUP]2[/SUP] = 40[SUP][SUB]2[/SUB][/SUP]
Therefore
x = 19.6
y = 34.9
 
We tested several materials for our cinema screens and went with Harkness perlux 1.4 for our non-3D screens and spectral 240 for our 3D screens. Prices were about 6 a squarefoot on the perlux and 10 a square foot on the spectral.
 
I would wait for RED to let us know what screen suppliers and materials will play best with their laser projectors. We already saw earlier this year at NAB that the screen material used was causing a ghosting effect. My first RED projector will be paired with a screen 7 feet tall, width is still to be determined as I can go up to 17 feet wide in that space, which would accommodate 2.40:1 just fine, but it seems the projector is going to have a 2:1 or 16:9 aspect ratio anyway. So realistically the screen is going to be 12.5ft to 14ft wide at that height. I guess we'll see what happens.
 
Da-Lite offers projection screens ranging in size from 40 inches by 40 inches to 60 feet by 90 feet.
 
Hello togther
We use screens of austrian manufacturer avstumpfl. www.avstumpfl.com. Standartwise they do not have a gain factor as we are very often use it for softedge projection with more then one projector. Gain Factors would screw the overlap as gain factors are depending on the visitors position in front of the screen. AV Stumpfl makes screens of outstanding quality and just about any size. We have some that we used for 20 years now, and they still work.
greetings Klaus
 
David Raspberry above answered all my questions and I highly recommend his services - prompt professional and great communication and knowledge!
 
Jeff Kilgroe said:
I would wait for RED to let us know what screen suppliers and materials will play best with their laser projectors. We already saw earlier this year at NAB that the screen material used was causing a ghosting effect. My first RED projector will be paired with a screen 7 feet tall, width is still to be determined as I can go up to 17 feet wide in that space, which would accommodate 2.40:1 just fine, but it seems the projector is going to have a 2:1 or 16:9 aspect ratio anyway. So realistically the screen is going to be 12.5ft to 14ft wide at that height. I guess we'll see what happens.
Click to expand...

Not sure if this will or won't work with the RED Laser projector since i'm not 100% sure what kind of lens to put in front of the RED projector yet but if the projector is indeed 16x9 you could purchase and put a Panamorph http://www.panamorph.com/ lens in front and that would allow you to use the entire chip errr laser for 2.40 instead of using any resolution for the black bars top and bottom. Of course this would assume the projector has the correct 4:3 and 16:9 and stretch modes needed to compensate as the panamorph lens will stretch the image which will then need to be desqueezed in the projector modes. Seems like too many variables yet to say but assuming the RED projector is similar to existing projectors on the market in terms of its menu features this could be a concievable option.
 
Since 4096 x 2160 is full 4K, and that is 17:9, or 1.896:1, I would be surprised to see a 16:9 panel, which would be 3840 x 2160. Plus, for wide screen movies, the wider panel can make better use of the image, with less pixels wasted and smaller black bars. 16:9 would seem a bit retro to me.

I think I read that the REDRAY player will be 4096. It would seem odd not to support that in the projector.

But with so many source aspects to work with, a display needs a lot of flexibility no matter what the native resolution. Anamorphic capability is rapidly catching on.

Rob McD.
 
Does anybody think Red will go into the screen business? I am serious. They could buy almost any screen company for the right amount and its the perfect on line model.
 
Lots of screen makers out there. Only Stewart for big and seemless. Trust me, you will see the seems, no matter what other makers might tell you. Do you have to pay and wait for a custom screen to be built? Yes, to the extreme!
 
Surprise all? Red wants the entire chain from capture through display and in projector land the screen is an integral piece of the display.

Now I doubt Red would get into the popcorn machine business because that would not be in the chain. If Red were to enter the popcorn machine market even I would be surprised.

Going back to screens. if Red uses passive 3D for its some say coming projectors, any single screen will be a very bad compromise. Two different screens are requires for 2D and passive 3D though single screens can be used with various hits on image quality.
 
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RED's 3D is via Passive Polarized glasses, and yes a specialized Screen will need to be used, even so some might claim a certain new fabric of Grey or white or silver can do both, and I have one right now that has this new most expensive type of fabric and works great, but I am eager to see RED's solution, if they do indeed decide to make one, and by last conversation I had with Jarred on this matter it seemed like there was going to be one, either if this comes form RED or a third party I don't know, but will see soon enough.


RED Pop Corn machine? Why Not, that could be pretty cool extra toy to have... ;)
 
The problem which can not be solved is the gain a 3D screen needs vs the gain of 1.0 needed to optimize 2D and of course the room environment needed for a low gain screen. There are compromise fabrics such as Stewart 5D I believe its called. But its a compromise. A polarizing preserving screen, technically called a screen with a high polarization extinction ratio, or in laymans terms often a silver screen. These fabrics work well in less than optimal environments but are still nowhere as good as a reference quality 1.0 gain screen in a dark black pit non reflective environment. silver sceens, requires long throws and really do bad things to 2D presentations. There are some scren fabrics with are quite good for 2D but have a high polarization extinction ratio. Almost as high a stewarts compromise 5D screen but even then do compromise 2D quality.
 
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