According to projectorcentral, if the optoma is 6' away, you will get a 6'9"H x 9'W image (in 4:3 mode). The bottom of the image will start 1'1" above the middle of the lens, this is the image offset. Other projectors offset is usually quite a bit less. The Benq has an offset of like 1" vs 1' from a similar distance.
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