@Quentin (Cue) ( and
@ruinexplorer ) Isn't the patrons seeing the hot spot of the
lens through the
scrim going to be a consideration when rear projecting, especially when rear projecting on a
scrim rather than an actual rear
screen surface
??
Toodleoo!
Ron Hebbard
Yes, the hot spot might be an issue. A couple of things to consider when using a short
throw lens is that some will be required to be at the center of the projected
image, making a visibly brighter area. Some, like office and home theater projectors, have the
image offset in the
lens which requires the
projector to be positioned above or below the projection area so that it minimizes interference in the
image and negates a hot spot. This type of
projector will probably be better for
scrim anyhow as it should make the
image more apparent to the audience. Not knowing exactly the type of
scrim makes this difficult to predict how the
image will ultimately look.
I would always recommend an
LCD projector over a
DLP projector.
DLP projectors have difficulty with certain colors and almost always have lower brightness than
LCD projectors.
Also, realize that
projector's native
aspect ratio may be very different than an actual video
aspect ratio. You'll see this alot in cheaper, brighter projectors.
For example, Epson makes a 6000lumen
projector that's 1080p compatible but the chip itself is 1200x800
In the same body, Epson makes a 5000lumen
projector that has a 1920x1200 chip.
In both cases, you'd be feeding a 1920x1080 video so internal digital cropping is occurring.
I think that you have some misinformation regarding imagers. You might be referring to single chip
DLP projectors that can have a variety of color wheels. These different color wheels are available to produce different ranges of colors, depending on use, so if you are looking to produce something out of that range, it might have difficulty. However, if you have one that has a generic color wheel, it will produce the same range as a standard
LCD, both of which fit within the Rec. 709 color gamut. A lot of how a
projector creates colors will depend on how it is interpreting the information coming in, the colored coatings on the
dichroic glass, and then the speed in which it is able to reproduce those colors. For what its worth,
LCD projectors appear brighter than single chip
DLP when producing a colored
image.
Your second
point is that when you pick a
projector, always look to see what is the native resolution. This is what the
projector will scale all other resolutions. The best quality
image is always set to the native resolution of the
projector. This sometimes takes some digging when looking through sales literature.