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Originally Posted by FranklinD
So, basically, for a neutral position, the lens needs to be parallel with the top of the screen in the center? Is that you you/they are saying?
Since this projector uses digital keystone correction, I guess I will avoid using it as much as possible. Actually, after messing with it more, I noticed that it's nearly impossible to get a perfectly square image. Does digital keystone correction decrease the quality to the entire image? Like it's either on or it's off? I would guess it would since it's digital and all of the information would have to be processed. Is that how it works?
Thanks for the help.
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Yes, if I interpreted Sony's math right...and I did review my thoughts a couple of different times. The center of the lens should be aligned with the top of the screen image area in a ceiling mount...reverse for table top. Also, you want to align the lens horizontally with the center of the screen image as well...the manual includes dimenional numbers for both the lens center from the case bottom and the horizontal offset from the center mounting screw.
I'll have to let someone else speak to the badness detailes of keystone. At a minimum, it's got to reduce resolution since it can't add image to square up the tilt...somehow it's got to make the fat part skinnier.
As far as picture squareness. I think keystone only corrects for up/down tilt. If the projector's not square to the screen from left to right, you're probably still going to be left with an out of square image using keystone. Even if is square there's a limit to how much keystone and Sideshot can correct...just work out the bizzaro math Sony used and it'll all be clear. :-)
Good luck.
-Brent