The latest full-frame flagship to join Sony’s A-mount series, the Sony Alpha A99 Mark II Digital SLT Camera Body features ultra-fast 4D FOCUS with 79 hybrid cross AF points, a 42.4-megapixel Exmor R CMOS sensor, 5-axis in-body images stabilisation for both stills and video, 12fps continuous shooting and advanced 4K movie functions.
Sony Alpha A99 II Digital SLT: Key Features
- 42.4 Megapixel 35mm Full-frame Exmor R CMOS sensor
- Hybrid Phase Detection AF system with accurate 79 hybrid cross AF points
- 79-point dedicated and 399-point focal-plane AF sensors
- Continuous shooting at up to 12fps
- Newly developed optical 5-axis in-body image stabilisation
- Outstanding operability and reliability in newly designed downsized body
- Internal 4K movie recording in XAVC-S format with host of pro-orientated movie features
The newly developed Phase Detection AF System is capable of ‘full-time AF’ and is the first implementation of 4D FOCUS in the full-frame a series, bringing a supreme new level of AF performance to a99 II users. The Hybrid Phase Detection AF System is enabled by combining a precision 79-point dedicated phase detection AF sensor with 399 focal plane phase detection AF points, to produce a 79 hybrid cross AF point array. These cross points deliver incredibly precise autofocus performance and advanced subject tracking of any moving objects right across the image, at high speed. In addition, as there is no moving mirror, TMT enables continuous AF operation and the finder image remains unaffected during any type of shooting, including live view and movie recording.
Low light conditions present no problem to the a99 II. The precision AF system will function properly down to EV-4 brightness levels where most other cameras struggle.
Data flow through the a99 II has been redesigned to allow for high resolution and continuous shooting at high frame rates. A new front-end LSI works with the image sensor and BIONZ X image processing engine, as well as a newly designed shutter unit, to enable continuous shooting at up to 12fps with AF/AE tracking, all whilst harnessing the sensor’s 42.4MP capabilities. The result is an ultra-fast camera that will deliver incredibly detailed shots, even with fast moving objects in challenging light conditions. Thanks to a large buffer and sophisticated data processing, these shots can be viewed immediately after shooting even when in high speed continuous shooting mode and if shots are being taken indoors under artificial lighting, flicker is automatically detected and the shutter is timed to minimise its effect on the end image.
Improvements to the EVF display algorithm now deliver continuous live-view shooting at up to 8 fps with AF/AE tracking with minimal display lag so that the viewing experience is essentially no different from that of an optical viewfinder. Exposure, white balance and other camera settings are displayed in real time in the viewfinder and continuous live view shooting can be set in 3 stages to match a variety of subjects: 8 fps, 6 fps and 4 fps.
The back-illuminated full-frame 42.4MP Exmor R CMOS sensor benefits from a gapless-on-chip design and allows for fast readout of large volumes of data as well as being extremely efficient in its light gathering ability. The net result is very high sensitivity with low noise, wide dynamic range and 42.4MP resolution across an ISO range of 100-25600, expandable to ISO 50-102,400. The a99 II has been designed without an optical low-pass filter to allow the finest natural details and textures to be captured with unprecedented depth and realism and the photographer can select compressed or uncompressed RAW files, as required.
5-axis SteadyShot INSIDE Image Stabilisation
Having proved to be incredibly popular in the a7 II series of cameras, Sony has designed a new in-body 5 axis image stabilisation system for A-mount cameras which debuts for the first time in the a99 II. In addition to movement in the pitch and yaw axes that tend to occur at longer focal lengths, this system effectively detects and compensates for shift blur that can occur on the X and Y axes when shooting close-up, and roll blur that is often apparent in still images and movies that are shot at night. Newly implemented precision gyro sensors are capable of precisely detecting even tiny camera movements that can cause blurring, providing a 4.5 step shutter speed advantage that can help realise the full potential of the 42.4MP sensor, in both stills and movies. The effect of image stabilisation can be monitored in the viewfinder or on the LCD screen during live view when the shutter button is half pressed or the Focus Magnifier functions are used. This allows framing and focus to be accurately checked via live view when shooting at telephoto focal lengths or macro distances.
Improved design and operability
The design of the new a99 II has noticeably evolved compared to its predecessor, based upon feedback from professional users. The new model is 8% smaller than the original a99 and has a newly designed grip, magnesium alloy body, dual SD card slot and other upgrades that improve both hold and operation. All major buttons and dials are provided with seals and the media jack cover and enclosure edges feature tongue and groove – the result is a body that is both dust and moisture resistant and can be used in the toughest and most challenging shooting conditions.
In addition to being designed for faster response, the new shutter unit is also more durable and has passed endurance tests in excess of 300,000 shutter operations. The XGA OLED Tru-finder has a ZEISS T* Coating and has a 4 element lens group that includes a double sided aspherical element whilst offering a powerful 0.78x magnification, delivering outstanding clarity from corner to corner. It also has a fluorine coating on the outer lens to prevent fingerprints, dust, water, oil and dirt from sticking, thus ensuring a clear view.
The silent Multi Controller introduced in the original a99has been improved so that in addition to allowing control of aperture, shutter speed, ISO, exposure compensation, AF area, AF mode and other settings, it now features a click-stop ON/OFF switch. When ON, the preferred setting for still image shooting, the control clicks, providing a tactile indication of the length of rotation. When OFF, the control turns smoothly and quietly, ideal for movie shooting. Location data acquisition has also been made possible via Bluetooth connection to a compatible mobile device and it is now possible to select whether the storage location should just be on a tethered computer or also on camera for easy review without leaving the shooting position. Based upon feedback from a number of a users, the menu structure of the a99 II has also been updated to deliver a smoother navigational experience.
The a99 II enables internal 4K movie recording featuring full pixel readout, without pixel binning, for ultimate high resolution video in the pro friendly XAVC S format. It is capable of recording high quality footage at 100Mbps for 4K recording. A new ‘Slow and Quick’ mode (S&Q) supports both slow motion and quick motion. Frame rates from 1 fps to 120 fps (100 fps) can be selected in 8 steps for up to 60x (50x) quick motion and 5x (4x) slow motion recording. A number of features designed for a professional movie production workflow are included such as picture profiles, time code and HDMI clear output and the new a99 II now also offers gamma assist for real time S-Log monitoring and a zebra mode for easier exposure adjustment. S-Log3 and S-Log2 gamma are now included, making wide dynamic range shooting possible with blown highlights or blocked shadows making the a99 II easily integratable into a fully professional movie production workflow.