Originally Posted by tn1krr
That follows my thinking too, but details on the characteristics of this new material are still a bit lacking. I mean things like
- what is the minimum throw distance?
- any drawbacks if projector is ceiling mounted eg. around top or a bit above screen?
- is it already available/shipping?
Just trying to figure out if this material is worth waiting/suitable for my environment (throw distance 1.7 x screen width, ceiling mounted projector...)
Reflections Active 170 3D is similar to most elevated gain screens; longer throws really help with minimizing hot spotting and maximizing center to edge uniformity.
The longer the throw, the more collimated the projected light is and the smaller the standard deviation of incident angles. This results in better image uniformity.
Reflections Active represents what Stewart Filmscreen feels is an optimum balance of light recovery for insertion loss, while retaining a functional half gain performance with 'normal' lenses. 1.5:1 throw distance would be a functional minimum, but the display quality will benefit a lot from longer focal lengths when possible.
Reflections Active is a great performer with high mounted projectors. The behavior of the material is to distribute light within it's stated off axis performance, along an angular reflective path. So a high mounted projector will tend to deliver light centered slightly lower than the angle of incidence. Reflections active is not retro-reflective like glass bead screens, which benefit from lower projector mounting options.
It's always good practice to keep the projector within the upper and lower limits of the screen's top and bottom sight lines when possible. Extreme mounting positions, result in the need to use digital anti-keystone utilities that have highly deleterious effects on image fidelity. Many projectors now have highly functional lens shift options, but not all are equal, and some extreme settings may affect brightness uniformity, increase chromatic aberration artifacts, and result in geometry distortions.
Reflections Active is shipping at the end of September 2011, and will be available in all of Stewart's mounting systems, fixed frame, electrically operated drop down, with or without masking. The material can be either Micro-Perforated or Cinema Perforated upon request.