The Sony A7s announced today adds a slew of new professional features to the company’s popular full-frame compact camera.

Chief among the new Sony camera’s features are 4K video capture, making it a serious option for DSLR / CSC film makers, as well as a direct rival to Panasonics GH4.
The Sony A7s enables uncompressed video capture at 4K by reading every pixel on its 12.2-megapixel, full-frame sensor, which the A7s’ BIONZ X processing engine then converts to QFHD 3840 x 2160 footage with selectable 30p and 24p frame rates.
However, the Sony A7s cannot record this 4K footage internally. The A7s will export the footage to an external recorder plugged into the camera’s HDMI port.
Of course while 4K video is the buzz, you still need to record in HD and without the ties of external recorders, so when it comes to capturing video on memory card the Sony A7s is capable of using the XAVC S format which enables Full HD recording at 50 mbs.
The Sony A7s also offers a number of other features that make it a serious option for video makers, including the S-Log2 gamma setting, which is common in commercial video equipment and no doubt a direct link to Sony's broadcast heritage.
This enables better colour grading in post-production by creating a claimed 1300% wider dynamic range to reduce whiteout and blackout.
SEE MORE: Nikon Df vs Sony A7R – which full-frame camera should you buy?
When it comes to styling your own footage Sony has added the ability to adjust gradation (Black level, gamma and black gamma) along with colour adjustment (colour tone and depth).
Once the look you want has been created it can then be saved and used as a profile which is extremely useful.
Like the Sony A7r, the A7s features audio in and out, as well monitoring.
SEE MORE: Sony A7r vs Nikon D800 – which full-frame camera should you buy?
Meanwhile, the ‘s’ in the A7s stands for ‘sensitivity’, and Sony has added a native ISO range of ISO 100-102,400 for both still images and movies – and both of these expandable up to ISO 409,600, or down to ISO 50.
Sony has used fewer pixels in the A7s than in its siblings, the Sony A7 and A7r, but its 12.2-million-pixel sensor uses larger pixels which Sony says allow for the greater sensitivity, as well as dynamic range and colour rendition.
The Sony A7s comes in a magnesium alloy body with a 7.5cm, 1.2-million-dot, tiltable LCD screen.
A Sony A7s price and release date were not announced at the time of writing.
SEE MORE: Sony A7 / A7r review
Sony A7s Specs Sheet
Size & Weight
Dimensions (W x H x D)
Approx. 126.9 x 94.4 x 48.2mm (approx. 5 x 3 3/4 x 1 15/16 in.)
Weight
Body Only: Approx. 446g (approx. 15.7 oz), With battery and Memory Stick PRO Duo: Approx. 489g (approx. 1 lb 1.2 oz)
Lens
Lens Mount
Sony E-mount lenses
Lens Compatibility
Sony E-mount lenses
Sensor
Sensor Type
35mm full frame (35.6 x 23.8mm), Exmor CMOS sensor
Image Sensor Aspect Ratio
3:2
Recording (still images)
Image Size (pixels), 3:2
35mm full frame L: 4240 x 2832 (12M), M: 2768 x 1848 (5.1M), S: 2128 x 1416 (3.0M), APS-C L: 2768 x 1848 (5.1M), M: 2128 x 1416 (3.0M), S: 1376 x 920 (1.3M)
Image Size (pixels), 16:9
35mm full frame L: 4240 x 2384 (10M), M: 2768 x 1560 (4.3M), S: 2128 x 1200 (2.6M), APS-C L: 2768 x 1560 (4.3M), M: 2128 x 1200 (2.6M), S: 1376 x 776 (1.1M)
Image Quality Modes
RAW, RAW & JPEG, JPEG Extra fine, JPEG Fine, JPEG Standard
Recording (movie)
Recording Format (Movie)
XAVC S / AVCHD format Ver. 2.0 compliant / MP4
Video Compression
AVCHD: MPEG-4 AVC/H.264, MP4: MPEG-4 AVC/H.264, XAVC S: MPEG-4 AVC/H.264
Image Size (pixels), PAL*
AVCHD: 1920 x 1080 (50p/28Mbps/PS, 50i/24Mbps/FX, 50i/17Mbps/FH, 25p/24Mbps/FX, 25p/17Mbps/FH), MP4: 1440 x 1080 (25fps/12Mbps), 640 x 480 (25fps/3Mbps)
Other Movie Functions
Audio Level Display, Audio Rec Level, Auto Slow Shutter, HDMI info. Display (On/Off selectable), Time Code/User Bit, Clean HDMI output for 4K, Picture Profile, Creative Style, Picture Effect, Rec Control, Dual Video Rec, Marker Setting
Shooting
Clear Image Zoom
Still / Movie: Approx. 2x
Lens Compensation
Peripheral shading, chromatic aberration, distortion
Storage Media
Compatible Recording Media
Memory Stick PRO Duo, Memory Stick PRO-HG Duo, Memory Stick XC-HG Duo, SD memory card, SDHC memory card (UHS-I compliant), SDXC memory card (UHS-I compliant)
Storage Media Slot
Multi slot for Memory Stick Duo / SD Memory card
White balance
White Balance Modes
Auto WB, Daylight, Shade, Cloudy, Incandescent, Fluorescent (Warm White / Cool White / Day White / Daylight), Flash, Color Temperature (2500 to 9900K) & Color Filter (G7 to M7: 15 steps, A7 to B7: 15 steps), Custom, Underwater
AWB Micro Adjustment
G7 to M7 (15 steps), A7 to B7 (15 steps)
Focus
Focus Type
Contrast-detection AF
Focus Point
25 points
Sensitivity Range
EV -4 to EV 20 (at ISO 100 equivalent with F2.0 lens attached)
AF Mode
Single-shot AF (AF-S), Continuous AF (AF-C), Direct Manual Focus (DMF), Manual Focus
Focus Area
Wide (25 points) / Center-weighted / Flexible Spot (S/M/L) / Zone
Exposure
Metering Type
1200-zone evaluative metering
Metering Sensitivity
EV -3 to EV 20 (at ISO 100 equivalent with F2.0 lens attached)
Metering Mode
Multi-segment, Center-weighted, Spot
Exposure Modes
AUTO (iAUTO, Superior Auto), Programmed AE (P), Aperture priority (A), Shutter-speed priority (S), Manual (M), Scene Selection, Sweep Panorama, Movie
ISO Sensitivity
Still images: ISO 100-102400, Movies: ISO 200-102400 equivalent (both expandable to 409600, for still: expandable down to 50)
Viewfinder
Viewfinder Type
XGA OLED, 1.3cm (0.5 type) electronic viewfinder (colour)
Magnification
Approx. 0.71x (with 50mm lens at infinity, -1m)
LCD
Screen Type
7.5cm (3.0-type) wide type TFT
Total Number of Dots
921,600 dots
Brightness Control (LCD)
Manual ( 5 steps between -2 and +2 ), Sunny Weather mode
Focus Magnifier
35mm full frame: 4.2x, 8.3x, APS-C: 2.7x, 5.4x
Peaking MF
Yes (Level setting: High/Mid/Low/Off, colour: White/Red/Yellow)
Shutter
Shutter Type
Electronically controlled, vertical-traverse, focal-plane type
Shutter Speed
Movies: 1/8000 to 1/4 (1/3 step), Up to 1/50 in AUTO mode (up to 1/25 in Auto Slow Shutter mode), Still images: 1/8000 to 30 sec., Bulb
Electronic Front Shutter Curtain
Yes
Image Stabilization
Steadyshot
Not supported (image stabilization supported on lens)
Drive
Drive Modes
3/5 exposures selectable), Bracketing (Cont., Single, White Balance, DRO), Single shooting, Continuous shooting, Speed Priority Continuous shooting, Self-timer (10/2 sec. delay selectable), Self-timer (Cont.) (10 sec. delay
Continues Shooting
Continuous shooting: Max. 2.5fps, Speed Priority Continuous shooting: Max. 5.0fps
Interface
PC Interface
Mass-storage, MTP, PC remote
HD Output
HDMI micro connector (Type-D), BRAVIA Sync (link menu), PhotoTV HD, 4K still image playback
Multi Interface Shoe
Yes
Auto-lock Accessory Shoe
Auto-lock Accessory Shoe compatible with supplied shoe adaptor
Others
Microphone terminal (3.5mm Stereo minijack), Headphone terminal (3.5mm Stereo minijack), Vertical Grip Connector
Audio
Microphone
Built-in stereo microphone or ECM-XYST1M / XLR-K1M (sold separately)
Speaker
Built-in, monaural
Power
Supplied Battery
Rechargeable battery pack NP-FW50
Battery Life (CIPA, Still Images)
Approx. 320 shots (viewfinder) / approx. 380 shots (LCD screen) (CIPA standard)
Battery Life (CIPA, Movies)
Actual: Approx. 55 min. with viewfinder, approx. 60 min. with LCD screen (CIPA standard), Continuous: Approx. 90 min. with viewfinder, approx. 90 min. with LCD screen (CIPA standard)
External Power
AC Adaptor AC-PW20 (optional)
Operating temperature
Range
32°-104°F / 0-40°C
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