Adjusting The Projector's Focus; Adjusting Projection Image Size - Optoma TW675UST-3D User Manual

Installation
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Adjusting the Projector's Focus

To focus the image, rotate the focus ring until the image is clear.
 XGA series: The projector will focus at distances from 1.58
to 2.17 feet (475 to 662 mm).
 WXGA series: The projector will focus at distances from 1.58
to 2.17 feet (495 to 661 mm).

Adjusting Projection Image Size

 XGA series: Projection Image Size from 63" to 85" (1.60 to
2.16 meters).
 WXGA series: Projection Image Size from 77" to 100" (1.96
to 2.54 meters).
Focus Ring