Read more at - http://elite-projector-screen.blogspot.com/2015/02/set-up-drop-ceiling-projector-mount-for.html
A projector screen focus is distance-dependent. Essentially, the projector apparatus is a post -focus one because the projection is not convergent but divergent. You see, it is not like the visuals coming to focus on a point! The system here is reverse whereby the projection is made from a pin-hole slit. Essentially, you can set the screen at any convenient distance in the line of projection, but the areas should be compatible. Start by demarcating the exact point in the roof to set up the drop ceiling projector mount.
Read more at - http://elite-projector-screen.blogspot.com/2015/02/set-up-drop-ceiling-projector-mount-for.html
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