HINT: LENS SHIFT AFFECTS IMAGE

I got my 8000 a couple of days ago and have just trying to get it tweaked to suit me.

The big thing I learned is that the use of the lens shift has a large affect on convergence. This may be common knowledge by this forum crowd but I didn't understand how much it affected it until I was unhappy with the convergence performance of the 8000 initially. I installed the PJ inverted on ceiling with the PJ essentially level and used the lens shift to center the image vertically. I had my mount in correct position so that hardly any horizontal shift was needed. My layout is with the PJ about 15.5 feet from a 92" screen with the projected image bottom about 42 inches above floor level. With the PJ installed to be level, convergence was out by at least 3mm, which I could notice which made print fuzzy and halo-ed and of course made images less sharp.

So, I moved the lens shift joystick to the approximate middle position and then tilted the PJ until the image hit the vertical level I wanted and the convergence was spot on. This adjustment meant that I had to use -5 of keystone adjustment but that doesn't seem to affect convergence. That places the front of the PJ about 2 inches lower than the back of the PJ in my case. Doesn't look as good as the PJ parallel to the ceiling but it definitely fixed the convergence issue and I am HAPPY!

Hope this helps somebody.
Edited by Dan@SI - 10/4/12 at 11:28am

Farsider,

With PJ tilted, the center of the lens is 3 inches above the top of a 16x9 image; with PJ parallel to ceiling, the center of the lens would be about 4.5 " above the top of a 16x9 image.

OK, I changed the name of the thread not to attribute the misaligned colors to convergence. The affect is still not acceptable to me. I will have to check out how much unhappiness the keystone correction causes. I have never used keystone correction on any previous projector as I didn't have or didn't notice the misalignment of the colors so much on other PJs. May have to do a little of each to get the image as good as it can be. I use a electric trapdoor screen so tilting the surface is impractical for me.
Edited by Dan@SI - 10/4/12 at 11:40am

I played a little more and used a test pattern that had a 1 pixel pattern and I could clearly see the affect of the keystone adjustment. So, I played with the PJ tilt and the lens shift to get the least CA with only a small amount of keystone affect which I am able to live with uncorrected. There is still a some CA but not as bad as the original amount. I could only use a 6" extender to lower the PJ as it is hung from an eight foot high soffit and happens to be over a large doorway between two rooms. 6" would help a little but would not permit positioning the image in the center of the lens to make for complete elimination of CA. So, I guess I will just have to live with it until DLP technology with sufficient lumens arrives.