Styling, Connections and Menus
Duplicated from almost every other 2012 Panasonic is the new, and much shinier, remote control which is conveniently backlit as well as being sensibly designed with most of the ‘important’ buttons ergonomically placed for one-handed operation. It does show up greasy fingerprints more readily than the outgoing design so make the kids wear cotton gloves around the house. Not in the box but necessary for testing the 3D aspect are a pair of Panasonic's USB rechargeable TY-ER3D4MU glasses. As we’ve said previously we’re big fans of the new specs with them weighing in at just 26g and being very neutral in tint.
The Menu has five primary sub-menus - Picture, Sound, Network, Timer and Setup but we’re just going to give you a rundown of the picture options here, having covered them in great detail in earlier reviews.
The Picture menu contains a choice of Viewing Modes including Dynamic, Normal, Cinema, True Cinema and Game. This sub-menu also includes all the usual front panel controls – Contrast, Brightness, Colour and Sharpness. There’s also the (unnecessary) Vivid Colour control and C.A.T.S. (Contrast Automatic Tracking System) option which is designed to adjust picture contrast according to ambient light in the room. Finally there is a P-NR (Noise Reduction) function that is designed to reduce compression artefacts and can be useful if you insist on watching the likes of ropey YouTube content on the big screen.
Out-of-the-Box MeasurementsWhilst it’s not quite what we could live with, the out-of-the-box Normal viewing mode with a Normal Colour Temp was far more accurate than every other factory mode we’ve published the results on, so far, with only a comparatively small excess of blue energy. Gamma tracking was far from ideal, however, which did give the picture a washed out look, although, to be fair, it wouldn’t have been a bad choice for a sun soaked room – so, around 7 days a year, in these parts. The colour gamut was predictably over-saturated and overly bright but hue errors were mostly respectable, with the exception of the orangey reds.
Basic Set-Up ResultsA quick switch in to True Cinema mode and setting Brightness and Contrast with the appropriate patterns brought us closer still to our targets with Delta Errors below 5 for greyscale in all but the brightest portions and a much closer representation of the Rec.709 gamut standard. Red is still the concern as far as the colour reproduction goes and we may be hard pressed to get it to fully saturate.
These are by no means the flattest charts we’ve seen from a Panasonic plasma in 2012 but, all the same, highly respectable with errors all below 2 throughout the scale. Gamma tracking is certainly improved by switching to the 2.4 pre-set, from the 2.2 default of True Cinema, but with no dedicated multi-point control or 10 point White Balance controls we were unable to get it totally flat. We were left with a choice of having a large spike – upwards – between 70 and 100% stimulus and maximising light output to around 120cd/m2 or taming the spike and dropping light output to nearer 100cd/m2. On balance, we found the bigger spike could give a waxy look to skin tones and opted for the slightly dimmer picture. That kind of output is fine for a lowly lit room but those in brighter viewing environments could use a little more.
Contrast and Black LevelThis is definitely the area where Panasonic have ruled the roost most comfortably in 2012. The results here were predictably first class, if ever-so-slightly less impressive than those we measured with the 65inch ST50. Full screen black clocked in at 0.013 cd/m2 with peak white reaching 103 cd/m2. As we said in the calibration section above, we could have had a higher output but at the expense of inferior picture quality. Still with an On/Off Contrast Ratio of just under 8000:1, it’s not a bad result. Intra-frame contrast, i.e. the relative difference between dark and light elements of the picture was also very impressive, with the 55ST50 hitting an average black level of 0.015cd/m2 against an average peak light output just under 77cd/m2, giving an ANSI contrast of 5261:1. Impressive stuff!
Video ProcessingThe performance of the P55ST50B in the video processing tests was excellent overall. Using both the PAL and NTSC HQV benchmark discs the detail and resolution test was reproduced correctly, with the P50ST50B scaling the full 576i image without any loss of detail or unwanted ringing. The ST50B also scored very highly in the jaggies tests on both discs as well as performing very well on the diagonal interpolation test, with two of the three moving bars appearing smooth and only the bottom most extreme bar showing very slight jaggies. The 55ST50 also had no problems in resolving all the fine brickwork in the detail tests as well as correctly displaying the waving flag footage.
The Panasonic TX-P55ST50 managed to correctly the 2:2 (PAL - European) film cadence, as long as the Clear Cinema function is turned on. The P55ST50B also performed well when displaying film material mixed with scrolling video text and correctly displayed the words without blurring or shredding. The ST50 performed extremely well in most of the tests on the HQV Blu-ray using high definition content and with the player set to 1080i the display correctly deinterlaced and displayed both the video and film resolution tests and showed very good scaling and filtering performance as well as excellent resolution enhancement.
When watching film based content you should always have the IFC function off, unless you want it to look like video. For the same reason you need to ensure that the 24p Smooth Film function is also turned off when watching 24p material. We used the Spears and Munsil disc to check the headroom performance of the P50ST50B which was very good, correctly reproducing from reference white (video level 235) up to peak white (video level 255) and showing picture information down to reference black (video level 17).
Gaming PerformanceAs with every 2012 Panasonic plasma display we’ve tested with our new dedicated device, input lag is higher than we’ve come to expect from them but most won't find a latency in the 47 millisecond range too debilitating. We’d like to see that number come down in 2013 and serious gamers are advised to try before you buy.
- Standby: 0.0W
- Out of the Box – Standard Mode: 203W
- Calibrated – True Cinema Mode: 149W
- 3D – True Cinema Mode: 299W
Picture Quality – 2D
The ‘big issue’ for the Panasonic plasma’s on the forums this year has come in the form of a uniformity issue. Last year we had the ‘green blobs’ which in 2012 has been replaced by vertical banding complaints; where owners can see thin vertical strips down the panel that aren’t illuminated to the same degree as the rest of the screen. We first spotted it with the UT50, which had one faint strip just in from the right hand side that was very occasionally visible on certain content. The retail sourced Panasonic 55ST50B, under scrutiny here, was almost identical to the UT50 with the same thin, feint strip just in from the right hand side but it also had another either side. Would we call it an issue? Perhaps but in this particular manifestation, one of only very minor proportions as it was so very rarely visible with real world content. That said, we have seen some instances that look a lot worse, at least in photographs, so we can understand how those affected would feel more greatly aggrieved.
In terms of a comparison to the Samsung plasma’s, there’s so little in it, in the larger screen sizes, that it will come down to a touch of personal preference and which niggles you can most easily tolerate/not live with. For the Panasonic 50Hz and DFC problems you can swap brightness pops and some floating blacks in the Samsung’s but, either way, you’ll be choosing the best of the bunch in 2012.
Picture Quality – 3D
- Very impressive black levels
- Superb contrast ratio and dynamic range
- Excellent greyscale when calibrated
- Close to reference colour gamut when calibrated
- Added calibration controls
- Reference level 3D playback
- Minimal crosstalk
- Excellent video processing
- Built-in WiFi and Freeview HD
- VIERA Connect is impressive
- Well designed menus and remote control
- Dynamic False Contouring
- 50Hz panning issues
- Only 3 HDMI ports
- Input lag could be lower
- Mild uniformity problem
Panasonic ST50 (TX-P55ST50) 3D Plasma TV Review
The True Cinema picture mode continues to be the best bet for ST50 owners seeking the most accurate images and the TX-P55ST50, reviewed here, made a reasonable fist at hitting the standards. Post calibration we were very close indeed to hitting reference greyscale and colour reproduction which, when backed up by the excellent contrast and black levels, helped to deliver pictures of an extremely high quality. The only real blights being some instances of dynamic false contouring and edge break up, particularly with content delivered at 50Hz. We did have some minor uniformity issues with the review sample, in the form of three very feint bands to the right hand side but they were so rarely visible, ‘issue’ is perhaps too strong a word. Along with the Samsung plasma’s, the G15 Panasonic’s are delivering some absolutely wonderful pictures in 2012 and we’re fortunate to have such great options.
The 3D images produced by the P55ST50B were excellent, with well-defined depth and a sense of solidity to the objects on screen; the P55ST50 is another winner from Panasonic that can deliver a wonderfully engaging 3D experience. As with every 2012 Panasonic plasma display we’ve tested with our new dedicated device, input lag is higher than we’ve come to expect from them but most won’t find a latency in the 47 millisecond range too debilitating
The TX-P55ST50B is another sure-fire winner from the Panasonic plasma stable that manages to combine class leading contrast performance with an excellent feature-set to produce a display worthy of an enthusiast’s attention. The fact they’ve managed to do that at an extremely attractive price-point only further cements the bestowing of an AVForums Highly Recommended Award.
Contrast/Dynamic Range/Black Level
3D Picture Quality
Ease Of Use
Value for Money
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