I have set up my NEC XG 110 and I am getting great results however I have noticed that the center section of the tubes looks more in focus then the corners and outer edge when projecting it on to the screen.

I made sure that the focus rings are at the correct sittings for my screen size. I also adjust the astig controls and all dots are circular but a bit better in the center.

Looking directly in to the tubes the cross hatch is perfectly focus. Am I looking to get too much from this PJ? When viewing a cross hatch patent all the vertical lines are very thin as it gets to the outer section of the screen they get a little thicker. Keep in mind that it in no way is it grossly thicker then the center. But if the lines should be just as thin in the center. I would like to adjust for it know that the tubes are still mint.

This may be asking an obvious question, but... did you adjust the EDGE focus? See attached pic, and p. 19 of the install manual (at least the 852/1352 install manual I have).

Yes I adjusted the center and edge lens focus then the astig completed by electronic focus.

If the focus looks perfect when looking into the tubes, it sounds like your electronic focus is good. If the image is sharp on the tube face but not on the screen, that's got to be an optical focus issue. If the whole image is sharp on the entire tube face, but the edges are blurry on the screen, that sure sounds like an edge-focus problem to me.

The edge and center focus rings interact with each other a bit. Did you try going back & forth between edge & center a few times until it settled in?

Are ALL the edges blurry? E.g. top-right, top-left, bottom-right, bottom-left? Or are some corners or edges blurrier than others? Maybe your lens flapping isn't right?

Centre is always going to be a bit better than edges/corners.

My 16:9 screen is 90” diagonal 78.5” wide and 44” height. My flapping rings are set at:

RED- H-3 V-3.
GREEN- H-5 V-3
BLUE- H-3 V3

When focusing the front lens the far left and right edge defocuses separately so one side can is more focus then the other. I decide for know to adjust where both sides look equal in sharpness.

Aha! That sounds like a flapping problem. Far left & right should focus sharply at the same time. Are all 3 colors doing this?

I downloaded the 110 service manual from Curt's site (http://www.curtpalme.com/docs/NECXG751_1101_1351_Install_User.zip). I thought NEC made non-LC 110's, but the manual only listed a 110 LC. Is yours an LC?

The NEC settings are specified for 4:3 screens, not 16:9. 78.5" wide would be 58.9" high for 4:3, so the diagonal would be 98". Assuming you have a 110LC, that would fit in the 90-109" diagonal range of the flapping-ring charts, and you've got the right settings for that.

Are you 100% sure your mechanical setup is good? Is the projector exactly centered in the middle of the screen, and exactly perpendicular to it? If it's rotated slightly to the left or right, that could cause the left/right focusing problems. You could probably resolve the problem by tweaking the flapping, but it would be MUCH better to correct your mechanical setup instead. The convergence &etc will be much happier if you do.

Yes my PJ is 110LC. I measured from the corner of the left and right corner of the screen an there is a 1" difference I don’t believe that it can possibly be causing the problem that I am having. You mentioned that I can adjust the flapping I thought by setting the rings to the screen size was the complete adjustment for flapping. Am I missing something?

Is 1' = 1 foot? If you're off by a foot, that would definitely do it. If 1' = 1 inch (which is written 1"), then that probably wouldn't.

You need to be dead center on the screen, and absolutely perpendicular to it. I never had any luck getting reliable results with measuring from the projector to the screen corners, etc. Try sighting along something square to the projector (like the mounting feet bolts) and mark where the sightline hits the left & right walls. Measure the distance from the screenwall to the sightlines. Both distances should be the same.

Setting the rings does adjust the flapping. The NECs have a few fixed settings that are supposed to be "good enough" for a wide range of screen sizes. But those settings assume a perfect mech setup! So for example if your projector is to the right of screen center and rotated to the left, the right side of the screen is closer than the left side, and the standard settings won't work right. You could mess with the rings to set them in between the standard settings and maybe compensate for your bad setup, but it's much better to get the setup right.

Here's a writeup that isn't complete yet, follow the postings of the writeups in order.. still being changed slightly before posting the whole thing in the main site, but it might help...

http://www.curtpalme.com/forum/viewtopic.php?t=4722&postdays=0&postorder=asc&start=0

I have a 110 AC XG so at some time they did put out AC units. I sure would like to convert it into a LC though. I have the same problem with focus and my 852 and found that the screen that I screwed to the wall actually followed the warp in the wall and caused uneven focus.