“Can I project a screen size of 70-100” from 8-10’ (feet) away, or adjust the screen size?”
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no you cannot with that Optoma GT760A that model is a ultra short throw projector. from say 10 ft. you are going to get a HUGE image, like 200+ inches. in order to get a 70-100" image from 8-10 ft. away, go with a normal throw projector. from Optoma that would be either the HD39darbee, HD29darbee, HD27, HD27e or even HD143X All are fine models of varying price points depending on what you need. also, for grins if you have never visited the calculator on projector central site, below is the link. you just plug in model you want to evaluate, screen size, distance or any of several parameters and the distance calculator takes all the guess-work out and shows you exactly the screen size. pay attention to lumens (brightness) and input/outputs you might need and what is your main source material. for example GT760 is a good machine but only 720P. the others models I listed are all I think 1080P resolution. hope that helps, https://www.projectorcentral.com/Optoma-HD27e-projection-calculator-pro.htm
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