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Panasonic TC-PST30 review:

Panasonic TC-PST30

The Panasonic TC-PST30 showed excellent picture quality overall, overcoming the paucity of adjustable picture controls with deep black levels and very good video processing. Compared to the more expensive GT30, which has THX mode, it actually delivered superior gamma and similar black levels, at the expense of some image brightness and color saturation--enough to earn the two the same performance score (between the two, ignoring price, we give the slight edge to the ST30 for dark-room videophiles due to its better gamma). Compared to the best 2010 plasmas from LG and Samsung the ST30's somewhat worse color accuracy was a liability, but its deeper black levels make up the difference.

As usual we ended up liking Cinema best among the various picture presets, but were disappointed to see that Panasonic again limited the amount of picture control available in that mode, leaving only Custom with access to the Pro Settings menu. So for our calibration we tried both Custom and Cinema, and ended up going back to Cinema.

The short story is that while Cinema is a bit dim--Panasonic mystifyingly limits its peak light output to about 32 fL, short of our target 40--it's still much more accurate than anything we could tease out of Custom. The latter mode was plagued by poor color decoding (red and green push) and washed-out gamma, as well as more low-level video noise (dither) after calibration, and none of the available controls could deal with those issues. In the end we'd prefer to get full picture control that actually worked, but had to settle for the dimmer and less saturated, but otherwise superior, Cinema mode.

As with previous Panasonic reviews we've included both our Custom and Cinema picture settings (linked above) so you can see the differences for yourself. And for the record, in a first for a CNET review, we didn't change one single setting from the Cinema defaults during our calibration (in other words, none of the changes we tried with the available controls improved picture quality), which is why the Pre and Post charts look so similar.

For our image quality tests we checked out "Harry Potter and the Deathly Hallows: Part 1" on Blu-ray using the comparison lineup below.

Comparison models (details)
Panasonic TC-P50GT30 50-inch plasma
Panasonic TC-P50GT25 50-inch plasma
Samsung PN50C8000 50-inch plasma
LG 50PX950 50-inch plasma
Samsung UN46D6400 46-inch edge-lit LED-based LCD
Vizio XVT553SV 55-inch full-array LED-based LCD
Pioneer PRO-111FD (reference) 50-inch plasma

Black level: The Panasonic TC-PST30 delivered a deep black shade of black overall, which was most visible in dark areas like the letterbox bars and the recesses of Voldemort's banquet hall, and the clothing of its denizens, in Chapter 2. We found it essentially impossible to tell the difference between the three Panasonic plasmas (despite the slight numeric difference between the GT and ST's 0 percent black measurements), and the ST30 surpassed the black levels of the Samsung C8000 and the LG. The UND6400 looked just a bit darker in some scenes but it was difficult to spot even in our side-by-side lineup. (In our GT30 review, which we've since modified, we originally wrote that the ST30 appeared "visibly lighter" but that was due to improper adjustment, since corrected, of the ST30).

One difference between the ST30 and the others was its dimmer image in Cinema mode. Highlights and bright areas looked a bit duller in our dark room as a result, a difference that was most noticeable in mixed dark and light material. The white hair of the diners and the lights of the chandeliers, not to mention Voldemort's pale face, all looked dimmer in comparison on the ST30, which robbed the scene of some impact and contrast. The snowy ground in Chapter 19 provided another example, and again the ST30 appeared too dim. Of course using Custom could address this issue at the expense of some color and gamma accuracy, and as usual this issue would be much less apparent outside of a side-by-side comparison.

The ST30 outperformed the GT30 handily in terms of gamma accuracy, a strength that showed up as realistic shadows with plenty of detail, as well as faces in well-lit areas that has the right amount of shading without appearing too washed out.

We kept an eye out for "floating blacks" or fluctuations in black level, but didn't notice any during "Harry Potter," nor during the scenes in "Tron: Legacy" that caused them to appear on the GT30. We also didn't see any overt fluctuation of black level on test patterns with the ST30. The issue might still be apparent in some scenes, especially at different picture settings, but in our experience it's quite subtle, at best.

Color accuracy: The inability to properly calibrate the ST30's Cinema mode cost it some accolades in this category, but Cinema was accurate enough in the end. Skin tones looked realistic, for example in the faces of Hermione and Harry in Chapter 23. Colors didn't appear as saturated as we'd like to see however, so the leaves on the forest floor and the green of the trees, for example, appeared less impactful and vibrant than on some of the other displays (increasing the color control wasn't an option since Cinema on the ST30 still evinces some color decoding errors, albeit not as prevalent they are as Custom). In its favor the also ST30 delivered a very accurate shade of near-black.

Video processing: The ST30 and GT30 performed basically the same in this category.

Like its 2011 brother the TC-PST30 passed our 1080p/24 test in its "60Hz'"setting. It delivered a much smoother cadence with the proper look of film than did the GT25 from 2010, and was basically indistinguishable from the C8000 (in Cinema Smooth mode), the Pioneer and the other sets with proper 1080p/24. The ST30 handled 1080p/24 the same way in 60Hz mode, so we assume Panasonic made a processing tweak this year. As usual we found the 48Hz mode flickered too much to be watchable.

[Update June 9] On the other hand we did notice some artifacts from 1080p/24 sources in 60Hz mode. On the "Digital Video Essentials" test Blu-ray we noticed shifting lines and minor instability in the downtown Philadelphia buildings during an upward-facing pan. We didn't see any similar issues during other program material, but assume they might crop up.

Panasonic also introduced dejudder processing this year with a setting entitled "Motion smoother." It delivers two options, Weak and Strong; they looked very similar to our eye, although Weak left a hint of more judder. As usual we found both relatively distasteful.

The GT25 from last year had a "Blur reduction control" that, when engaged, delivered full-motion resolution. That control has been dropped for 2011, but Motion smoother basically does the same thing: when it was engaged, in either Weak or Strong, we saw an increase in motion resolution in our test pattern (see the Geek Box). As usual any blur was impossible for us to discern with real program material.

The ST30 passed our 1080i deinterlacing test with 3:2 pull-down set to On, but not when we used the default Auto (and, despite what the menu explanation says, this setting does affect HDMI sources).

Bright lighting: Panasonic modified the antireflective screen used by the ST30 and GT30 compared to last year, and as a result we saw deeper black levels and contrast under the bright lights than on the GT25, the LG PX950 or the Samsung C8000, but not deeper than on the Kuro or the LCDs. We did notice brighter reflections in the ST30's screen compared with the GT25, but overall we still consider its bright room image quality an improvement and among the best plasma screens we've tested.

That said its dimmer picture in Cinema mode is even more of a liability than usual in a bright room, so you'll probably want to use a different, brighter picture setting under the lights at the expense of some accuracy.

3D performance: The ST30's 3D picture quality was very good overall but compared to the other 2011 3D TVs in our lineup, it was our least favorite. Crosstalk was minimal, on par with the GT30's, although black levels on the latter were a bit better. The superior contrast of the UND6400 gave it the edge over the ST30, overcoming its slightly worse crosstalk, while the UND8000 series (subbed in for 3D in our lineup) outperformed them all.

Comparing between the four using "Tron: Legacy," for example, we saw a bit more crosstalk in the Chapter 5 dressing room scene with the D6400--visible as ghostly outlines around the girls' forms during one overhead shot, for example (28:00). On the UND8000 those outlines were much dimmer, while the Panasonics split the difference.

In other scenes, like the piping Quorra's dark suit as she looks in the mirror in Chapter 9, the UND8000 again outperformed the plasmas at reducing crosstalk, although both again showed less than the UND6400. In this scene the GT30 actually showed a bit more crosstalk than the ST30, a difference we assume has to do with the former's brighter image.

The ST30 showed the lightest blacks of the bunch, and as a result dark areas washed out quite a bit compared to the LEDs and, to a lesser extent, the slightly darker GT30. In the other hand the ST30's whites were dimmest as well, so as a result its picture was the least contrast-y and punchy among the four.

We appreciated that the ST30 (and GT30) lacked the annoying moire artifact we first noticed on the grid floor of the command room in "Avatar" (at 12:20, for example) when watching the GT25.

As usual we checked out 3D using the default settings--Cinema in the ST30's case--since we don't currently calibrate for 3D.

Power consumption: The TC-P50ST30 uses a bit less power than the TC-P50GT30 post-calibration--perhaps the latter's thinner cabinet is a factor--which allows it to creep into Average territory considering its screen size and match the "efficient-for-a-plasma" G20 from 2010. It's no power miser compared to LEDs, however. In case you're wondering, Standard is still woefully dim, albeit brighter than the GT30, while the Cinema mode we used for testing consumed 181 watts (mainly since it's dimmer than Custom, which is what we used for the "Calibrated" numbers here since it actually hit 40 fL.)

Test Result Score
Black luminance (0%) 0.0094 Average
Avg. gamma 2.3482 Average
Near-black x/y (5%) 0.3106/0.329 Good
Dark gray x/y (20%) 0.3076/0.3253 Poor
Bright gray x/y (70%) 0.311/0.3304 Good
Before avg. color temp. 6531 Good
After avg. color temp. 6519 Good
Red lum. error (de94_L) 2.1834 Average
Green lum. error (de94_L) 1.7366 Average
Blue lum. error (de94_L) 2.8963 Average
Cyan hue x/y 0.2247/0.3329 Good
Magenta hue x/y 0.3243/0.1584 Good
Yellow hue x/y 0.4108/0.494 Average
1080p/24 Cadence (IAL) Pass Good
1080i De-interlacing (film) Pass Good
Motion resolution (max) 1200 Good
Motion resolution (dejudder off) 800 Average
PC input resolution (VGA) n/a n/a

Juice box
Panasonic TC-P50ST30 Picture settings
Default Calibrated Power save
Picture on (watts) 131.93 215.77 N/A
Picture on (watts/sq. inch) 0.12 0.2 N/A
Standby (watts) 0.1 0.1 N/A
Cost per year $29.00 $47.38 N/A
Score (considering size) Average
Score (overall) Poor

Annual energy consumption cost after calibration

Panasonic TC-P50ST30 CNET review calibration results

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