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This may be of limited utility but here’s a distance calculator for Optoma models: https://www.optomausa.com/distancecalculator
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I posted a follow up to Bob on my use with the GT1080. You can read here: http://www.ontheglideslope.net/forums/topic/are-you-running-with-the-projector-gt1080/
My real world experience is: I made it work, but it wasn’t as perfect as I’d like it to be. Because of the distance in order to get 100″ there’s a small shadow cast from part of the cockpit as well as the very bottom of the screen (~1″) gets clipped from view. It works for my dad’s sim we’re building with the space requirements we have, but personally with the one I’m building for myself, I don’t have enough room and will need to go with the Optoma GT5500.
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P.S. I also had to play with the keystoning, horizontal and vertical offsets and zoom extensively in order to fill the 100″ screen properly.
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Bob,
This weekend I was working on a flight sim I’m building for my dad. We opted to use the Optoma GT1080. The screen is 21″ from the front of the cockpit. The projector is 42″ away from the screen and is mounted 95″ off the ground. Also, because of distance of the short throw (not ultra short throw) I don’t actually have the cockpit itself centered on the screen–the cockpit is slightly to the left of center, else you could see the edges of the screen. The projector itself is centered horizontally to the screen. The projector mount we built is at ~25 degree angle with shims to adjust the tilt. He didn’t want to mount the projector into the ceiling, hence the mount built onto the cockpit itself. I think we may revise this so that it sits unattached to the cockpit so that movements of the flight controls don’t vibrate the projector.
Matthew
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It’ll still be a few days before I get a chance to see if the GT1080 will work for me. I considered rear projection as well, but I don’t think the room is deep enough for it.
One thing to note for those considering buying an ultra short throw, the Optoma GT5500 has a similar short throw distance to the EH320UST (100″ picture at 22″ for the GT5500 vs 21″ for the EH320UST). While the lumens are 3500 for the GT5500 and 4000 for the EH320UST, the GT5500 is a bit cheaper. ($200-300 cheaper)
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@Uriel Will do.
