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Zoom droop


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I set up a projector a few months ago with its image filling the screen. Noticed today that there was a white border visible all around the image. The zoom "knob" is a protrusion on a ring that is concentric with the lens. So its weight distribution will be asymmetrical and presumably the "heaviest" bit is creeping towards the ground courtesy of gravity and fan vibration: zoom droop. And me sober! :off:
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