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"Hmm.... it seems I'm though wrong and must appologize, since the shift is from the centre of the screen (as stated in Panasonic's manual).
So now I'm confused. According to the manual, if we shift the projector vertically up by 63% from the centre of the screen, won't the calculation mean the lens will be lower than the top edge?
I'm planning the set-up and got totally confused now...
Thanks in advance for your help!"
If your screen is 50" tall, then you multiply 50 by .63 which gives you (about) 31.5"
You can move the projector (center of lens) about 31.5" above the CENTER of the screen. This puts the centerline of the lens about 6.5" above the top edge of the projected image. Closer to 13% instead of 16%.
Since my screen is 106" diagonal it could be a bit over 6.5" above the top edge of the screen. This, of course, goes with the concept that there is no horizontal lens shift in use which will bring down the vertical lens shift range.