As we noted with our review of(look carefully, there is only one digit of difference in the model number), we are reviewing two 47 inch (119cm) Panasonic LCD TVs. The other offers active 3D. This one is notable primarily for using passive 3D technology. Instead of flashing the left and right eye views up on the screen in sequence, it shows them both at the same time on alternating horizontal rows of pixels. Since there are just the usual number of pixels — the screen's full HD resolution is 1,920 by 1,080 — the vertical resolution is reduced in 3D mode (and only in 3D mode). By how much is a topic of controversy.
One big advantage of passive 3D technology is that the eyewear works simply by means of polarised lenses, similar to the way 3D is presented in the cinema. Consequently, they are relatively light and cheap. Panasonic supplies four pairs with this TV (additional sets are $30 for two, or you can just use the ones you get from the movies). The supplied ones weigh only 17 grams.
Other than styling and price (this one costs AU$300 less than the L47ET50A), there isn't too much to distinguish between the models. This one apparently lacks the more advanced "8 train speakers" used by the other model (according to the manual, but not Panasonic's website), but it sounds adequate anyway, which is all you can ask from the built-in speakers of any TV. It is a little less slender at 52mm deep, and has a more substantial frame around the picture — around 35mm. The swivel stand has a straight rather than forward-reaching pedestal.
The TV supports time shifting and recording if you're prepared to plug a dedicated USB hard disk drive into it.
The 3D performance was top notch, in terms of crosstalk rejection. On the static test, instead of the 30, 40 or even 50 per cent of the leakage shown by many active 3D systems, this TV scored about 5 per cent for white leaking through a black background from one eye to the other, and 0 per cent the other way around. Nor was there any colour shift (so long as you look straight through the lens, rather than turning your head, which would make the light enter the lens at an angle).
But we noticed something strange when checking compatibility. The crosstalk was a touch lower with both RealD 3D glasses from a cinema and LG TV 3D glasses. There wasn't much in it, but if you have some previously purchased 3D glasses, try them out.