Sony announced the new Sony Alpha a7S, a 12MP full-frame mirrorless camera designed not only for still photographs, but also for video. This model from the series of the world's smallest full-frame interchangeable lens cameras can read all the information collected by the sensor so fast that it can output 8-bit 4:2:2 4K video over HDMI at up to 30p, without resorting to line skipping or pixel binning. Moreover, this trait secures higher quality for the 1080p video, which the Alpha a7S can record internally. As opposed to the a7 and a7R, this model is not restricted by the AVCHD standard; what is more, the Alpha a7S offers the XAVC S system with bitrates to the value of 50Mbps.
What is of vital importance to mention is the fact that the Alpha a7S is the world's first camera to use the entire width of a full-frame image sensor during the 4K video recording. In addition, this camera accomplishes this without cropping and the already mentioned line skipping since it can read and process data from each one of the sensor's pixels.
As far as video recording is concerned, the higher quality footage is available solely over HDMI. The Alpha a7S also offers a Dual Record option by virtue of which recording takes place at both low bitrate 720p and XAVCS 1080p simultaneously.
As for the letter S in the camera's name, it stands for sensitivity. While shooting movies, the Alpha a7S offers an ISO value from 200 to 102,400, with extension to 409,600. The company also states that the large pixels that the camera displays will provide good dynamic range, gradation and color fidelity for still photography shooters.
Sony did not stop at this stage since they are 'broadening their arsenal' and preparing a movie-focused 28-135mm f/4 Powerzoom lens. Neither of the products has been priced yet.
The Sony Alpha a7S will encompass a range of S-Log2 gamma aimed at recording movies, together with several Picture Profiles which were previously part of Sony's FS series of high-end camcorders.
The news was taken from SONY.