View Full Version : Panny 58PZ800U


nicholas01
10-20-08, 04:21 PM
People keep mentioning how much better 24p/48HZ is when viewing blu-rays but I really don't see a difference. Can someone please provide a few good blu-ray scenes that I could refer to in order to see a difference.

I set my PS3 to 24P output and my 58PZ800U to accept 48HZ. I am aware of the flicker problem, but it doesn't bother me too much. I just want to see the difference to see what all the hype is about.

CragAntler
10-21-08, 05:30 AM
People keep mentioning how much better 24p/48HZ is when viewing blu-rays but I really don't see a difference. Can someone please provide a few good blu-ray scenes that I could refer to in order to see a difference.

I set my PS3 to 24P output and my 58PZ800U to accept 48HZ. I am aware of the flicker problem, but it doesn't bother me too much. I just want to see the difference to see what all the hype is about.

The only purpose for choice of 48/60/72Hz is to suit the subjective experiece of the user. Some people see "judder" at the standard 60Hz rate. Judder is sometimes noticeable when the shot "pans" (swiveling the camera on a tripod, or just following a subject) from one side to the other, with the effect being that the picture seems to stop for a split second, then catches up with the pan, several times over the length of the panning shot.

If you don't notice this effect, or it does not bother you, then you should be just fine leaving the setting at 60Hz.

If the judder is very noticeable and constantly distracting, then choosing a rate that 24 divides evenly into (48, 72) will nullify the judder, as judder is an artifact caused by the conflict of film shot at 24 fps and displayed at 60Hz, which does not divide neatly with 24.

The downside is that the human eye seems to conform best to the 60Hz television refresh rate, and adjusting this up or down enough MAY cause a noticeable "flickering" effect on the whites and off-white parts of the picture. Some people are not bothered by this, or if they are, quickly get used to it.

I tried it on my 850U, and the flickering was extremely annoying and gave me a headache. Perhaps I may have gotten used to it after a bit, but because I have yet to notice any judder at 60Hz, it's a no-brainer for me to use that setting instead.

If you see any flicker at all at 48Hz, but no judder at 60Hz, you should use 60Hz. If you get bothersome judder at 60Hz, but aren't bothered by the flicker you see at 48Hz, then use the 48Hz setting. It's completely subjective, and neither setting is "better" unless it's better for YOU. Also, it's not something that anyone can share with you in a still screen shot. It's a motion video phenomenon.

shidarin
10-21-08, 10:16 AM
I and my friends and wife can't see any flicker but we've seen judder from time to time. Look for judder in fast moving pans- try Behind Enemy Lines (jet getting shot down scene) or Speed Racer...

potat0head
10-21-08, 01:39 PM
Generally speaking, the higher the refresh, the less chance of any given person seeing flicker on bright white elements of the picture.

The center of the eye has the highest detail and best color / intensity perception, however it operates slower than the outer vision areas. For many people 60 Hz plus is more than adequate to keep the perception of flicker at bay. Many people are good over 50Hz, with everybody being good over 75 or so.

For the outer eye, add 10Hz to those numbers for all but a very small segment of the population.

It's not so much that we are tuned to 60Hz somehow. More like 60Hz happens to be where the boundary is for enough people to be significant. Higher is better, but too high delivers no real return.

The overall impact of this depends on the persistence of the phosphors as well. The higher the persistence, the less noticeable the flicker is. Of course, the downside is blurry motion and left over images and trails on serious intensity transitions. That dynamic generally drives the need for higher refresh rates above 60Hz as most people become aware of motion blur and trails long before they become aware of the flicker effect, and if they do become aware of it, it's in the outer region of their field of vision where it's got the least impact.

Running the device at a lower overall brightness level, and reduced contrast does mitigate this, at the expense of visual dynamic range.