You calculate min and max throw distances for a given screen size. Say you want an 80in wide screen. You use the equations to give you the min and max throw distance for your projector. This means that the projector can be placed anywhere between those 2 distances to give you your 80in screen. At the min distance from the screen (ie with the projector at its closest to the screen) you would have the PJ on max zoom. At the max distance you would have the PJ zoom at its minimum. So to answer your question, if you mount the projector outside of the min and max distance the image will be bigger or smaller than your screen which zooming in or out with the zoom ring will not be able to correct for. It will still be in focus though.
In answer to Exsodius. Yes the throw distances are the same for both AE100 and AE300. If the PJ cannot be positioned where you want it AND give you the screen size you want then you can get a long throw lens BUT they cost a fortune!! $500?? AFAIK
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