Originally Posted by Signia
So you want the 1080p24 for movies because that is the true native of the movie right?
Jacko05 is right, but if you want the why, here it is.
If you convert a 24 frame source to a 60 frame per second display, somewhere along the line you have to double frames. I'm not sure exacly how the projector does it, but the process is usually called 3:2 pull-down. 3:2 pull-down is actually for displaying 24fps material on a 30fps display, but the technique for getting 24 fps to display at 60fps is similar.
The result is that some frames are displayed a little longer than others. This results in what is called "Telecine Judder". It's mainly visible in slow smooth pans across a scene.
The ideal is a display device which is capable of actually displaying the picture at 24, 48, or 72fps (all even multiples of 24) On a DLP projector, 48 or 72 would be ideal because actually displaying 24fps would mean the color wheel would slow down by more than half. So, if you display at 48fps, each frame of the 24-frame original is diaplayed twice, or 3 times for 72fps. Anything less, such as 60fps, would mean that some frames would be displayed only twice, and some would be displayed three times. That is what causes the judder.
One thing to watch out for is that some projectors will accept a 24fps input, but will actually display it at 60fps. For DLPs, you have to listen to the whine of the color wheel to know whether or not it's speed decreases to display 48fps (or increases to display 72fps) Or just watch a scene where judder should be visible and see if it is there or not.
Personally, I think movies should be filmed at 60fps since the cost of film is becoming less and less an issue with digital cinema cameras and digital cinemas on the rise. Even in the theater I have noticed the studdering of a 24fps pan (a studder that is different from judder)
With regards to the HD80, I'm amazed at the price. I didn't think we'd see a sub $3000 DLP until the Nov/Dec timeframe. I got a HC3100 in Dec 06. Perhaps this time next year I'll think about getting a 1080DLP since at the current rate I'm sure one would be under $2000 by then. Hopefully I'm wrong like I was last time, and 1080p will be even cheaper than that in a year!