“I would be upgrading from a Optoma 1080GTDarbee. Are the throw ratios pretty similar, are they interchangeable setup wise? Would I be able to just add the GT1090HDR to my current mount/projector set up?”
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The GT1090HDR has a short throw lens with a 0.5:1 throw ratio; you can get a 100-inch diagonal image with less than four feet distance. You might want to place the projector lens a few inches below the screen for best results. The machine has a a focus ring, no optical zoom, but a 0.8-2x digital zoom, digital horizontal and vertical image shift (+/- 30 degrees), and auto keystone correction. Check out this tool for exact calculations and comparisons: https://www.projectorcentral.com/Optoma-GT1090HDR-projection-calculator-pro.htm
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