Originally Posted by DanF8500
I'm not sure who to believe anymore about certain 8500 tv settings, but a number of 8500 owners over the past year on this and the 8500 Recommended Settings threads mentioned to leave Contrast at around 95, because lowering it will increase dithering on the picture. If the screen is too bright with that high contrast, then reduce cell light, and of course, brightness.
the problem with the contrast is if you put it lower than 95(lower than 100 actually I believe) it shifts the 10pt controls and totally messes up the greyscale. it can be fixed, but it takes a lot longer since the 10pt controls no longer line up. I actually haven't heard(or personally noticed) any change in dithering from adjusting the contrast. i'll have to check that out too.
that being said, when I did mine, contrast at 95 and cell light 20, gave me about 50ftl, which is way bright imo. I was able to get good results using contrast setting of 90, but that's still over 35ftl. I would considering that a good setting for ambient light viewing, but it's what I'm going to use full time until I feel like doing something better.
now, with all that being said, this is recent, and I've had my tv being used as my pc monitor with the contrast up at 95 and cell light at 20 for about a year. the ir is basically imperceptible, and never lasts. I now have over 1600hrs on mine, and I accidentally left it on overnight displaying avs forums for about 7hrs straight. that definitely left some ir, but it cleared up within the hour.
so, if you're getting 'the worst ir' after watching one movie. you're either very picky about ir, have a 'dud', or you need to get more hours on the tv. I don't remember every having ir issues, even at the beginning, but I always tend to be a bit overprotective at first, so I'm not even sure how many hours I put on it before doing anything that could cause ir.