Apr
7
Projectors and Keystone
Filed Under Home Theater Projectors
Without getting into a longwinded conversation on projector mounting 101, suffice to say there’s the right way and every other way to mount a projector. Sure lens shift can help you overcome some obstacles in the light path but even lens shift has its limits, once you go beyond those your back on the bad side of wrong.
Here’s my point and I’ll make it quick. It’s fine to be a few inches above, below, to the left or right of the screen with a projector with lens shift, but you want to (if at all possible) avoid using digital keystone correction.
Keystone presents itself as the image bowing out from the top or bottom in some cases in a “V” pattern, i.e. the top of the screen is larger than the bottom or vice versa. Using digital keystone correction to overcome this bowing can introduce a moiré pattern around fine lines in the image that are spaced closely together; as such keystone correction should be a last resort scenario.
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