| Author | Message | ||
     Matt (Matt) New member Username: Matt Post Number: 2 Registered: 2-2007 Rating: N/A |
I've been running an active setup for watching my 3-D movies but I've recently began to piece together a passive system and have on order a Silver 3D screen from SilverFabric. I've never had experience with silver screens so the question I have is this - can the projectors be aimed at the screen at an angle or do they need to be positioned at a perfect 90 degree angle to the screen to allow for proper polarization and viewing? For now my only option is to set the projectors up on my coffee table and pointing up at a slight angle with a viewing distance of about 15'. Once I get everthing up and running I'll do a quick review and take a few snapshots of the system for anyone who would be interested  Dual Infocus X1 243cm x 142cm SilverFabric 3D screen Berezin polarized filters and 3-D glasses Ghetto stacker Ghetto filter holder Nvidia GeForce 6200 Stereoscopic Player (greatest 3-D software on the planet... Thanks Peter!) | ||
| Larry Elie (Ldeliecomcastnet) Junior Member Username: Ldeliecomcastnet Post Number: 26 Registered: 10-2006 Rating: N/A |
I can be off at least 15 deg above, but never tried more. | ||
| yitzhak weissman (Itsikw) New member Username: Itsikw Post Number: 6 Registered: 9-2006 Rating: N/A |
Generally, it is recommended to view a silver screen at the angle at which the light would bounce if the screen would have been a mirror (the specular angle). In this scenario you benefit from both highest brightness and best polarization. | ||
| Larry Elie (Ldeliecomcastnet) Junior Member Username: Ldeliecomcastnet Post Number: 27 Registered: 10-2006 Rating: N/A |
I just checked the Hurley manual for the "Silverglo". Viewing angle is 30 deg. | ||
| Matt (Matt) New member Username: Matt Post Number: 3 Registered: 2-2007 Rating: N/A |
While waiting for my screen, I wasted some time by experimenting with a home made one simply using Rustoleum 7271 silver and a cheap 37"x55" window shade. Surprisingly enough it worked quite well but was very difficult to cover evenly (2 cans and a light head - 3 cans probably would have done the trick). The polarizers work fantastic as ghosting was very minimal and in some cases non-existant with the exception of high contrast scenes (white objects/black background). Viewing angle worked fine with my setup but will probably be different with the Silverfabric. Thanks for all the input as I might look at ways to tilt my screen forward when it arrives. (Message edited by matt on September 24, 2007) | ||
| yitzhak weissman (Itsikw) New member Username: Itsikw Post Number: 7 Registered: 9-2006 Rating: N/A |
You may try Oracal silver grey plotter foil. It is used for signage, bu it is also a very good and inexpensive material for 3D displays. I already recommended it on several occasions in this forum. | ||
| Matt (Matt) New member Username: Matt Post Number: 4 Registered: 2-2007 Rating: N/A |
The Silverfabric screen arrived and I was astonished that it performed far beyond expectations. There was virtually no ghosting whatsoever and the very slight amount that was visible in extreme high contrast areas wasn't noticable unless I strained to "find" it. The screen was definitely worth the investment. For anyone who uses this type of material, are there any recommendations or DIY tips on a good way to mount or frame the material? I'm currently using double sided tape on my old screen but I'm still getting surface imperfections. | ||
| Larry Elie (Ldeliecomcastnet) Junior Member Username: Ldeliecomcastnet Post Number: 28 Registered: 10-2006 Rating: N/A |
It's made to be laced up from the back, under tension. | ||
| lcdvasrm (Lcdvasrm) New member Username: Lcdvasrm Post Number: 2 Registered: 5-2008 Rating: N/A |
Following on the Angle of view problem posed, I would like to have a desk create images in 3D. You would sit at it like at a desk. Using polarized light, 2 projectors and a sylvered surface placed on the desk. yitzhak weissman said : Generally, it is recommended to view a silver screen at the angle at which the light would bounce if the screen would have been a mirror. Then, Assuming the projector is at a 45° down angle in front of you. Assuming I have the full control over image generation (I can reproject the image). Assuming one of the viewers head is tracked. Is there any chance i can get a good picture for 1 to 3 persons ? Is there any chance of having an image that is not blurred on the top and/or bottom ? Or it will always be blurred because the screen is not in the focus plane ? In addition, what material could be placed over the sylvered screen on the desk that would harden it, protect it and keep its reflection properties ? Plastic, Glass ? | ||
| yitzhak weissman (Itsikw) New member Username: Itsikw Post Number: 9 Registered: 9-2006 Rating: N/A |
Putting a projector at 45 deg may cause focusing problems. It is not a good idea to cover the screen with glass of plastic. These materials may reflect the projector beam into your eyes. For your application I suggest that you try an aluminum sheet or silver oracal foil deposited on glass. | ||
| Peter Dawes (Wheatstone) New member Username: Wheatstone Post Number: 1 Registered: 6-2009 Rating: N/A |
Would be most grateful if you could specify which Oracal product you've used. SMP Sign Systems at http://www.smp-sign-systems.com/produkte/Selbstklebende_Plotter_Folien_e.html list Oracal 751 in silver-grey. Is that the one? Also, is it simply self-adhesive, so can be applied over the existing screen surface? Many thanks. | ||
| yitzhak weissman (Itsikw) New member Username: Itsikw Post Number: 11 Registered: 9-2006 Rating: N/A |
Peter, Any foil labelled "Silver Grey" should be appropriate. They have different numbers according to the series. Yes, it is self adhesive, but for manual application use soap and water. | ||
| Nico Meijers (Smeijers) New member Username: Smeijers Post Number: 1 Registered: 1-2010 Rating: N/A |
Only the Oracal 631 type has a matte surface: http://www.oracal.com/products/product.asp?seriesID=182&tabID=ts This is important when you project from the ceiling, and when the room isn't dark enough. You will not get disturbing glare from the matte surface. In other cases you might consider Oracal 951, 751 or 651, because they have slightly better extinction (little less ghosting). The foil has an adhesive on the backside. Be sure the surface you put it on is absolutely flat. (I used 4mm thick MFD plate.) And no dirt or even dust specks must get under the foil. All to get as smooth a surface as possible. Start in a corner, so you can pull the 'protectionsheet' with one hand. Once you applied the foil, you cannot use it again, while it won't be as smooth as the first time. I succeeded to get a 1m5 x 1m2 cheap and good silverscreen (with silvergrey 631-090). Half gain angle is small though. From a viewing distance of 2m, the edges are slightly dimmer than the center. But I'm pretty satisfied. Have not compared it with a commercial screen, yet. Have fun. |
