Originally Posted by Jaseus
As in the attached picture, I’ll probably be able to get the three surrounding walls dark (Bedroom wall, screen wall, and exterior wall). The carpet is dark and the couch will be dark as well. Wife might be a bit of a tough sell to get the ceiling dark but I will keep it as a priority.
When dealing with the screen, why does the ALR screen cause the projector to have to be further back? The electrical is already ran and my outlet for ceiling mount is 13’ back from the projection wall. Is it safe to say that every projector will benefit from an ALR screen? I was planning to get the Silver Ticket 120”. In my situation, would you recommend a grey or white screen?
I think the 60Hz is important for those new streaming service as it will probably annoy me not being able to stream the 4K content without extra steps. I think I will count out the 4010 and return it and wait for a sale on either the 5050UB or the 3800 in the fall. Between those two, and being able to see the room, it seems like the 3800 might be the best bang for my buck. Sorry about mentioning price, just having to take that into consideration, especially if I’ll be spending more on the screen now.
Angular ALR screens are like a mirror. If the projector is too close the light beam from the center will reflect back towards the viewer, but the sides will have an angle that is further away from the viewer's position. This will result in the edges being dimmer than the center:
As it's noted in the post, cameras can mask the hotspot effect. With time it will be noticeable. If there are a lot of bright screens, it will be more noticeable. I highly recommend the projector be placed further back.
Sparkle will also appear in the center of the screen in bright scenes, which is not captured in those clips.
With an 120" and 13' lens to screen the throw ratio is ~1.34x. But if the mount is at 13' the lens would be closer to the screen.
With angular ALRs there must be no source of light from the same direction as the projector.
Many ALR screens have a grey base which deepens the blacks and in combination with the reflective film increases contrast. ALR screens can also become dimmer as you move further away from the central axis. A 40 degree half gain means that at that angle the screen is half as bright as when viewed from the central axis.
If the projector can't be placed further back I don't know if the visual artifacts are acceptable. While ALR screens will help with some ambient light for when viewing sports for example, don't know if it's worth the drawbacks. I would not get one unless the projector can be mounted at 1.9x throw ratio.
Not any projector can take advantage of ALR screens, they must have the throw ratio and be placed at it to avoid artifacts.
Easiest solution here is to treat the room and get a white screen. Even if the ceiling is not treated. Grey screens will dim the entire image especially the bright whites and colors, so I don't know if you'll like it.
ALR screens are from Elite (Cinegrey 3D and 5D) and Silverticket High Contrast Grey. The Elite are better quality. Also available in fabric only is from Carl's. Elite's are also available in fabric form, which can be mounted on a wooden frame to reduce cost.
Samples are available from these manufacturers.
As also mentioned several times are paints. Paints can have ALR properties and the entire wall can be painted. Or paint a cheap white screen. Since paints are customizable you can set it so it does not have hotspots/sparkle.