Panasonic Lumix GH4: the first Micro four thirds camera that records in quality 4K Panasonic ampl a su gama de c maras con objetivos intercambiables introduciendo un nuevo modelo con un nuevo sensor Digital Live MOS, un sistema de contraste AF mejorado, ISO de 25600 y una velocidad de enfoque de aproximadamente 0,07 segundos.
Pensando en vide grafos profesionales, Panasonic acaba de anunciar la nueva Lumix GH4. Basada en la tecnolog a Micro Cuatro Tercios, esta c mara permite usar objetivos intercambiables y ofrece una gran calidad de imagen, superando incluso su antecesora, la GH3.
La nueva Lumix GH4 evoluciona en funcionamiento, durabilidad y prestaciones para dar respuesta a los usuarios profesionales. As , es la primera c mara del mundo que puede grabar en calidad 4K, (Cine 4K a 4096 2160 / 24 fps y QFHD 4K 3840 2160 / 30 fps) en formato mov o MP4 (usando una tarjeta de memoria SDXC/SDHC compatible con UHS Speed Class 3 y un bitrate de grabaci n de v deo alto superando los 100 Mbps). El usuario puede grabar v deos Full-HD con un bitrate de 200 Mb por segundo (ALL-Intra) o a 100 Mb por segundo sin l mite de tiempo de grabaci n1, 2 La nueva c mara tambi n realiza fotograf as en formato RAW e incluso es posible editarlas desde la misma c mara.
Este nuevo modelo incorpora conexi n Wi-Fi y tecnolog a NFC, lo que ofrece al usuario gran conectividad con otros equipos. Adem s, con la Image App de Panasonic se puede controlar tanto la realizaci n de fotograf as como de v deo a trav s de un Smartphone o Tablet. As , el usuario puede ajustar remotamente la velocidad de obturaci n, la exposici n o la apertura, entre muchos otros par metros.
Digital Live MOS sensor
El nuevo sensor Digital Live MOS de la GH4 presenta mejoras tanto en calidad, sensibilidad como en r pida respuesta. La descarga del sensor es aproximadamente un 50% m s r pida, con lo que se consigue minimizar el efecto rolling shutter incluso con el obturador electr nico o en el modo de grabaci n de v deo. El procesador Venus Engine tambi n ha sido renovado, mejorando su funcionamiento gracias a un nuevo CPU quad-core que permite un procesamiento de se al a alta velocidad, requerido para grabar en formatos de alta calidad, como el 4K.
La GH4 integra un sistema de reducci n de ruido avanzado que le permite alcanzar una ISO de 25600. Este modelo, adem s, ofrece una velocidad de disparo de 12fps (AFS) hasta aproximadamente 40 (incluyendo el formato RAW) o aproximadamente 100 (sin incluir RAW) a 7 fps (AF tracking) para capturar n tidamente sujetos en movimiento.
Panasonic tambi n ha mejorado el sistema de contraste AF de alta precisi n a trav s de la integraci n de la tecnolog a DFD (Depth from Defocus)7, que permite disminuir el tiempo de enfoque para conseguir un AF de ultra alta velocidad de aproximadamente 0,07 segundos. De este modo, Panasonic no s lo ha mejorado la velocidad sino la operatividad gracias a la adici n del AF con detecci n de cara y de ojos, que ha pasado de las 23 reas de enfoque de la GH3 a las 49 en este nuevo modelo. As , el usuario puede realizar una composici n m s flexible que, junto al modo Personalizaci n M ltiple (Custom Multi AF Mode), le permite seleccionar aquellas zonas que se desean enfocar.
Tanto el nuevo visor 16:9 como el monitor son de tecnolog a OLED, lo que permite una respuesta de alta velocidad adem s de una mejora de la resoluci n. El visor OLED de la GH4 de 2.359K ofrece un alto contraste de 10.000:1 para una mejor reproducci n del color. Igual que en su antecesora, la pantalla t ctil posterior de la GH4 de 3 pulgadas y 1.036 K rota 180 lateralmente y es abatible 270 .
Con el objetivo de soportar los usos m s exigentes, la estructura de este nuevo modelo est compuesta por una aleaci n de magnesio fundido a presi n. Como su antecesora, la GH4 es resistente a las salpicaduras y al polvo gracias al sellado de todas sus partes. Adem s, el obturador, que permite una velocidad de 1/8000, ha sido tambi n redise ado para alcanzar aproximadamente los 200.000 disparos.
High speed and sensitivity
El nuevo sensor Digital Live MOS de 16,05 megap xeles de la GH4 alcanza gran calidad y sensibilidad durante la grabaci n con una r pida respuesta. Una se al de salida aproximadamente un 50% m s r pida elimina el efecto de rolling shutter, incluso usando el obturador electr nico o grabando una imagen en movimiento. El n mero m ximo de im genes capturables es 40 para el formato RAW y 100 sin RAW. Para obtener el m ximo rendimiento del sensor, el rango de gradaci n se ha ampliado hasta un 1/3 a ISO baja con el control detallado del procesador Venus Engine. Adem s, una mayor reducci n del ruido permite una exposici n larga de 60 minutos con el modo B (bulb).
El avanzado multiprocesador de reducci n de ruido (NR, por sus siglas en ingl s) reduce el ruido en la imagen y adapta el procesamiento a la frecuencia de cada componente. Adem s, el filtro aleatorio granula el ruido crom tico para que se integre en la imagen de forma m s natural. Como resultado, se consigue una ISO m xima de 25600.
Por otro lado, la combinaci n de dise o del nuevo sensor, el nuevo procesador de imagen y el filtro de pasa baja permite aumentar la resoluci n en m s de un 5% adem s de eliminar el moir . El nuevo filtro de mejora de la imagen permite controlar un mayor rango de imagen y ajusta el enfoque seg n el nivel de frecuencia, dando lugar a un efecto estereosc pico muy realista.
El procesador Venus Engine mejora la reproducci n del color con una evaluaci n precisa de cada uno de los colores, incluso cuando stos se parecen no s lo en tono sino en saturaci n y luminosidad.
Professional use
La Lumix GH3 ya ofrec a una experiencia de uso muy profesional. El nuevo modelo va un paso m s all y se convierte en la primera c mara CSC que graba en calidad 4K. Los usuarios pueden elegir entre los formatos mov, MP4, AVCHD progresiv
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Panasonic Lumix GH4: the first Micro four thirds camera that records in quality 4K Panasonic ampl a su gama de c maras con objetivos intercambiables introduciendo un nuevo modelo con un nuevo sensor Digital Live MOS, un sistema de contraste AF mejorado, ISO de 25600 y una velocidad de enfoque de aproximadamente 0,07 segundos. 
