On 11-09-05 2:51 PM, Larry Colen wrote:
I wonder if this would work, and if so would there be a market for it...
To make a background for photos, take a projector that has video inputs and
shine it on the background. It wouldn't be bright enough to not get washed out
by strobes, so replace the halogen bulb with a strobe. You'd need a modeling
bulb for it, but it wouldn't need to be as bright as the regular bulb used in
those projectors.
It would also be handy as flash that had it's own built in gels, of any color
you wanted, as well as it's own gobo (up to the contrast ratio of the LCD).
I wonder what it would cost to make one, and how much of a market there would
be for them.
The probable technical problem with your invention is that the shutters
and colour filters used in DLP/LCD projectors are tuned to the
brightness of the halogen bulbs, ie 250-500 watts. They only block so
much light and so have a contrast limit. If you popped a brighter light
in there you'd maintain the same contrast and your projected image would
be washed out and indistinct. The black level would come up so that the
darkest black in the image would become very light gray.
But besides that ...
It's actually pretty easy to mix LCD projectors and strobes. You treat
the projection background like you would a black backdrop and arrange
your lighting so none, or very little, of it falls on the background.
You can use softboxes, barn doors and/or gobos, etc. to make sure the
LCD image isn't washed out. Then you do the shutter-dragging thing to
make sure you get enough light from the background after you trigger the
flashes. So you might set the camera to f/5.6 @ 1/15th sec manual.
I've done this, it works.
-bmw
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