Sony’s a7S II Delivers Internal 4K Recording, 409,600 ISO

September 11, 2015

By Greg Scoblete

Sony has rolled out the final update to its full frame mirrorless a7 trio with the new a7S II.

The new 12-megapixel a7S II delivers a native ISO range of 100-102,400 with an option to expand to 50-409,600. According to Sony, the camera’s BIONZ X processor has an updated algorithm to help it crunch the image data to ensure an optimized dynamic range and to keep noise at bay as you push into those higher ISOs.

It features the same 5-axis image stabilization system that was incorporated into the a7 II and a7R II. 

The a7S II can now record 4K video (3840×2160) internally using the XAVC S codec with full pixel readout and no pixel binning, which Sony says helps improve clarity and reduce moire. Bit rates hit as high as 100Mbps and you’ll have an option of 30, 24 or 25 fps frame rates for 4K recording. 

You can take advantage of full pixel readout without pixel binning when shooting Full HD video at either 24 or 30p. The a7S II gathers roughly five times as many pixels that are required to produce an HD video and oversamples them to improve quality. 

The a7S II can also record Full HD at 120fps in full frame format. New picture profiles have been added, including S-Gamut3, Cine/S-Log3 and S-Gamut3/S-Log3, to produce flatter files with more dynamic range. The S-Log3 profile delivers 14-stops of dynamic range. When shooting in S-Log, Sony added a new Gamma Display Assist feature to make it easier to monitor images and check focus. 

The autofocus system on the a7S II now features 169 AF points with improved contrast detection in low light environments down to -4EV. The AF performance is also twice as fast as the original a7S during video shooting, Sony claimed.  

Rounding out the a7S II feature set:

* an upgraded XGA OLED viewfinder with .78x magnification and T* coating

* a redesigned grip and shutter button

* silent shooting mode for 5 fps burst shooting

* clean HDMI output (422, 8-bit)

* a reinforced lens mount

* USB recharging while the camera is in use to extend battery life

* Wi-Fi and NFC

The Sony α7S II ships in October and is available for pre-order now for $3,000

Sony also announced that it will ship seven new FE-mount lenses by “early 2016” though no other details were available.