Panasonic PT-50LCZ70 50" LCD LIFI Rear Projection HDTV Page 2
The Panasonic's main strength is its excellent resolution over HDMI and good resolution on component (except at 720p). This is a fine result for what is, in today's market, a bargain big screen set. While it isn't quite as subjectively sharp looking as some set's I've tested on a one-pixel sharpness pattern with its Sharpness control on minimum—technically, the best setting—you can push this to -20 without incurring the full wrath of the edge enhancement gods. Even at -30 no one could call the Panasonic soft, and at -20 good HD program material was always beautifully detailed.
While out of the box the Panasonic's color temperature is higher than desirable even in its Warm setting, that's still the only setting you should use even if you don't choose to have the set fully calibrated.
When I performed a calibration using the coded service menu (the Pro Setting sub menu does offer high and low level adjustments for blue ands red, but not for green), I initially obtained reasonably good results. But the result turned out to be unstable, with the measurements sometimes zeroing in nicely on D6500, but jumping to around 7400K at other times—without me making any additional adjustments that should affect color temperature. For more details on this, see "Measurements."
Nevertheless, even with this odd instability (which was less obvious in viewing normal program material than you might think) the Panasonic's color, after calibration, was good. Flesh tones could look a bit warm, but never objectionable, and greens were actually more neutral looking than I expected given the set's slightly too wide color gamut (again, see "Measurements").
The Panasonic's 480i-to-1080p video processing was generally good with either component or HDMI, apart from a few tests on which it was merely fair (the Jaggies 2 and waving flag tests on the Silicon Optix HQV Benchmark SD DVD). Its 1080i-to-1080p deinterlacing (as indicated on the HD HQV Benchmark HD DVD) was fair, and like most sets we've measured to date the Panasonic does not recognize 3/2 pulldown in a 1080i source.
But there was a serious issue with the Panasonic's reproduction of blacks and dark grays. There is no polite way of putting this: they were simply poor. Nearly an order of magnitude worse than the blacks I measured in a recent review of one of Panasonic's latest flat panel plasmas (admittedly somewhat more expensive than this PTV).
The net result of the set's combination of respectable color, excellent resolution, and poor blacks is a set that sparkles on the brightest images. The set is in its element with (daytime) sports and other inherently bright, punchy program material. But as soon as the average picture level of the images drops to the mid-brightness range and below the picture turns progressively more faded and two-dimensional, with increasing visibility of the "gray fog" that's typical of inferior blacks. The bright scenes in Dante's Peak (HD DVD), for example, looked fine. But when the scenes in that movie turned dimmer, with less intrinsic contrast, the Panasonic's image degraded dramatically. None of the Panasonic's controls or optional settings could significantly improve this situation.
As is often the case in a display that cannot reproduce convincingly deep blacks, dark scenes with bright highlights on the Panasonic could sometimes appear acceptable at first glance. There's a clip from a Nine-Inch Nails concert on a recent Dolby Demo disc (HD DVD and Blu-ray—to my knowledge the Dolby disc is not publicly available but Nine Inch Nails' live Beside You In Time is available on both formats). It's very dark, but relieved by bright highlights as the stage lighting plays against the performers. Because of these highlights, the image on the Panasonic looks acceptable on such material and doesn't immediately strike you as washed out. But if you look carefully at the black areas of the picture, particularly in what should be a solid black background, you'll easily see that those areas are a medium gray and nowhere near the inky blackness they should be.
Two other problems also intruded. The most serious was a pair of narrow, horizontal bands that ran across the center of the screen from left to right. I first noticed them when checking the set's (acceptable) color uniformity with full screen white fields at various brightness levels. The bands were most visible in the mid-brightness region. They were bright enough to be clearly visible on images with solid swaths of solid color or white, but were often masked by more complex scenes.
There was also a noticeable misconvergence at the very top of the picture, with slightly displaced reds that were visible mainly on a crosshatch test pattern but never obvious on normal program material.
The Panasonic's fine resolution would do justice to many sets at two or three times its price. If the rest of its performance were up to that level it would easily earn a recommendation. Panasonic is also to be commended for being the first to come to market with a new, potentially revolutionary lamp technology.
Unfortunately, however, there are issues here we cannot ignore. The most serious is the set's black level. You can get far better black and shadow detail performance in many flat panel sets, including Panasonic's own. These models carry street prices not much higher than this one.
The equation changes when you jump to larger sizes, particularly 60" and above. Then the alternatives become much more expensive. The 61" equivalent of this set, the PT-61LCZ70, is thousands of dollars less than most 60" flat panel displays. We have not looked at that model, so cannot comment on how it might compare with its smaller brother. But if you are considering it, I strongly recommend that you check it very carefully in the store for signs of the problems I experienced with the PT-50LCZ70, particularly its performance on difficult, darker scenes.
•Good, but not excessive brightness
•Poor blacks and shadow detail
•Respectable but somewhat unstable color
•Horizontal bands across the center of the screen
•Will not accept 1080p/24 inputs