Help me understand optical keystone

[frogmort]

Originally Posted by spaceape

Alright here goes anyway. Judging from the pictures it seems im a liar and both corners are affected but strangely looking through my own eyes the right side doesn't seem that much effected.







I guess the only remedy is too find a new place for the pj lower down the rear wall.

Yes, I would guess that if you have your vertical lens shift all the way down as low as it will go and it's still not enough, you probably either need to raise the screen a little bit, or lower the projector a little.