Michael,
I sell and install large video projection systems and have
several thoughts for you.
1. Large Venue-grade projector. These projectors may or may not
come in DLP technology, but if you have any ambient light in the
room (even reflected light from the screen itself) the 20,000:1
contrast ratio means little in the real world. 800:1 is going to
be outstanding if the ambient light is under control. This grade
of projector also takes interchangeable lenses, but the
screen-size you are specifying should be quite doable for a 40'
throw with the standard lens.
2. Horsepower. There is no substitute for cubic inches and
Lumens. For your screen size you need to be running a minimum
of 4000 lumens. The more lumens, the better the highlights will
be. More to that in a moment.
3. Paint the projection "wall" a very light gray. Make sure it's
matte paint. This will maximize the projector's contrast ratio
by keeping the blacks clean (offsetting the need for DLP) and
helps retain the details in the highlights.
4. Optical keystone correction! DO NOT buy a projector that
doesn't use optical keystone correction. The digital keystone
correction throws away pixels. Again, large venue projectors
almost always use a proper lens shift to provide keystone
correction.
5. Sanyo. Their higher grade projectors have the most even
illumination from edge to edge and the lenses are supurb.
6. Stay away from the "consumer grade" or "boardroom" grade
projectors. The lenses just don't have the oomph for the size
screen you are hitting.
7. Save your pennies and get a really decent projector next
year. You'll end up spending the money anyway.
AG
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