Got my LL projector ceiling mounted.. It's at about 15 degree angle downward.. I aimed it almost straight the other day, and couldn't believe how much the picture improved quality wise. Only problem is now the image is up high on my wall and I'm getting a stiff neck trying to watch it

Has anyone done any keystoning without using the front fresnel? Just wondering if there is a way to leave the projector straight and maybe point the triplet down or something? -I know that doesn't work cause I tried - I'd like to get my image lower on the wall and still retain the clarity.

Any suggestions?
thx
the_big_show

Yeah, its call lense shifting, I know i've seen it in someone plog and a couple other threads.

Basically you shift the triplet and front fresnel down (in your case) leaving the LCD and collector fresnel and bulb alone. Make sure to keep the triplet and front fresnel ligned up, so the fresnel will focus all the light on the triplet. The size of your fresnel will determine how much you can shift it before you start cutting off the screen....
If youve already cut the fresnel to match your LCD then you will have to look for a new larger one...
This will allow you to keep good focus because all the elements in the system (triplet,fresnel,lcd,screen) are all parallel to each other. The downside to lense shifting is you dim the edge of the screen....Since the axis of the bulb and rear fresnel are offset from the axis of the triplet and front fresnel the light must travel farther from the top of the lcd to reach the triplet than from the bottom

What i would suggest is using monitor controls to move the image down as far on the panel (widescreen), and just minimize the amount of angle you do.

Hey, did you ever get around to painting the screen?

There are some video cards that support keystone correction, but of course this sacrifices resolution.

I use Lens shifting, much better then keystoning in my oppinion. but requires a slight curve in the screen. You can also offset the bulb, but its better to buy a large fresnel.

so how much correction (degrees) can you get with lens shifting without degrading the picture brightness too much ?

Try this one...

I had similar issues/concerns and always struggled with getting the lower third of my projection to be sharply focused. I ended up lowering the ceiling mounted projector slightly and then tilted the screen so that the projected image hits the screen perpendicular. We don't even notice the angled screen and the image is now very clear.

Sam