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Erik,
I understand how the digital image shift makes the automated lens memory work if the lens is vertically positioned anywhere between the top and bottom of the 2.35:1 screen. My question was about when the lens is positioned outside that range-- say, higher than the top of the screen, as is typical for ceiling mount configurations like mine (or lower than the bottom of the screen, like for some coffee table configurations). I don't understand how it could work in such cases, without additional manual adjustment of the vertical lens shift on every 16:9<->2.35:1 switch.
I have a 2.35:1 screen and a projector (Sony VPL-VW50) ceiling-mounted with the lens higher than the top of the screen, and I once tried to see if I could switch between 16:9 and 2.35:1 modes by using the projector's motorized zoom adjustment only (not its optical lens shift) along with the digital vertical image shift provided by my video processor (which is much more convenient to adjust than the projector's optical lens shift), but I quickly stumbled into the problem I described previously: with the lens's zoom and shift adjustments set for the 16:9 subarea of the screen, there is a certain offset between the vertical position of the lens and the top of the projected image-- from that point, merely zooming so that the image fills the width of the 2.35:1 screen inevitably increases that offset further, such that there is no projected image in the top band of the screen, so no amount of digital image shift can move the 2.35:1 subimage high enough.