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Author Topic: Definition of "dual digital"? Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-27-2013 04:34 PM                     quote: Manny Knowles Next question: Do all dual systems use a beam splitter? No. Most simply try to position both projectors as close together as possible to minimize parallax between the two lenses. Keystoning is not such a big issue, since both lenses support lens-shift, thus, there is little to no keystoning. The Christie Duo solution is the only 'off-the-shelf' self-adjusting beam-combiner solution that I know of. Most manufacturers only sell special rigs that allow two or more projectors to be stacked more easily. IMAX uses an electromechanical shift system as well. I once heard it would shift the whole projectors in 2 or 3 axes - but I guess that is a misconception. Some IMAX theatres I believe have a rail system that allows a switch between 15/70 and digital IMAX. It doesn't make sense to have an electromechanical shift device for a 200kg projector when the motorized lens shift and electronic pixel shift can achieve exactly the same. If you do a Google picture search for 'imax dlp' you will find a few images showing a pair of more or less standard DLPs side-by-side in fancy IMAX branded housings. I have an IMAX digital operations manual which explains that there is a camera mounted between both projection ports, it measures picture adjustment data each day from a calibration image and adjust the overlapping through a so called 'Image Enhancer'. An interesting aspect of the digital IMAX projection system is that is has NO motorized focus. And of course, they ARE thinking about 4k: http://www.daveonfilm.com/how-the-imax-version-of-skyfall-was-created-10519.html - Carsten  |  IP: Logged

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