Originally Posted by MuscleCBT
Howdy guys! I've got a 14' by 12' by 9' mostly white room for my home theater, and no, I can't paint it black. I have the fantasy that I can put a 100" to 110" ALR screen on the wall but I'm not sure I have enough throw distance (which is 12 feet). I don't need it to be acoustically transparent.
I read very good things about the Seymour Ambient Visionaire 1.3 silver screens, the CineGrey 5D from Elite, and the FireHawk 5C from Stewart. Will any of these work at a twelve foot throw distance, and which would be best? My projector is an Optima UHZ65.
Most of the time the lights will be moderately down, but for football I'd like to see my chips...
It does not have to be black, a dark shade will do.
Or use curtains for the sides, dark rug on the floor.
The ceiling would also need to be treated. If it's a high ceiling, then the reflections would be less of a problem.
The area that if treated will be most beneficial is closest to the screen, 5' or more (or less if it's an enclosed area), but it may look strange to paint only part of the room in one shade, and the rest in a different one.
A screen should not be chosen until the projector has been used for a few weeks on a wall. Do you have the UHZ65 already and have used it.
If yes, are you sure about the screen size?
Although this is a personal preference, 110-110" from 12' borders on the small size.
To alleviate issues with screen wash out, in treated room or not, with an ALR screen or not, light should not hit the screen directly. Canned lights can be used, but only in the seating area, or maybe on the sides of the room.
A white screen (for instance) in a treated room will be superior to a ALR screen in a room with white walls.
A grey screen can, in a small amount, help with image washout.
A paint mix would be a much better solution. They can have a positive gain, no hotspot, some ALR properties. It's not complicated, the paint can be applied on a smooth wall or a white PVC screen.
A user recently purchased an Cinegrey 3D, which is a less aggressive version of the 5D, and at 1.77x the screen still had a hotspot. The hotspot will manifest when the image is brighter. The minimum throw ratio for both the 3D and 5D is 1.5x.
Originally Posted by bdht
1.4 for the jvc 1.5 for the w1070
Yes. at this throw ratio to get rid of the hotspot would take a stewart studiotek100 or a dalite parallax/dnp supernova, evp darkstar9. The neve and seymourav glacialwhite should also be hotspot free. Possibly elunevisions fixed frame material though i dont have a sample.
Not all the screens mentioned in the quoted list are ALR. Some of these screens can be very expensive. Although the claim is that they will not hotspot at that throw 1.4/1.5x, I don't know if that is actually the case. Looking at the specifications of the fabrics they look very similar to the XY Black Crystal 0.8 ALR, which has some hotspot at 1.5x.
Even a screen with lower ALR properties, the Firehawk G4, which has a minimum throw of 1.3x might.
With samples it can be difficult to determine if a fabric hotspots.
Most ALR fabrics have a minimum throw of 1.5x or higher, but 1.9x (or higher) is recommended to avoid these issues.
I mentioned the screen size earlier.
You can play around with the calculator to see what throw ranges can be had with 12' or 12' 7" (if the projector would be placed as backwards as possible).
For instance, for a throw of 1.5x from 12' (144"), the width of the screen would be 96". That's a 110.1" screen.
The advantage with paints is that they can be customized to the specific setup, which is easier than trying to pick between different screens that may be close, but not quite there. Not to mention a painted screen would be very budget friendly. This way a larger screen could also be used, is desired.