The Sony Alpha A7R mark IV continues the series of full-frame mirrorless cameras. Characterised by impressive stills and video performance. This fourth edition of the a7R sees the inclusion of an updated 61MP CMOS sensor and image processor. These give impressive imaging results with 15-stops of dynamic range, and high speed. For example, up to 10 fps shooting is possible along with the ability to record UHD 4K30 video. Both with support for Real-time Eye AF and Tracking AF technologies. The revised sensor provides 567 phase-detection autofocus points, for fast and accurate focusing. In addition, it has a flexible sensitivity range from ISO 100-32000. Finally, the A7R IV retains the 5-axis sensor-shift image stabilisation. This is effective in minimising the appearance of camera shake by up to 5.5 stops.
The A7R IV also sees an updated physical design with more robust weather sealing. Also, the OLED electronic viewfinder is now an impressive 5.76m-dot resolution. This results in clear viewing. Dual UHS-II- SD card slots for faster performance. Additionally, built-in Bluetooth and both 2.4 and 5 GHz Wi-Fi afford wireless transferring and remote camera control.
61MP Exmor R BSI CMOS Sensor and BIONZ X Image Processor
Featuring a back-illuminated design, the full-frame 61MP Exmor R CMOS sensor works with the BIONZ X image processor. This provides impressively high-resolution stills and video while minimising noise, improving speed, and achieving a wide 15-stop dynamic range. This sensor structure works with gapless on-chip lens design and an anti-reflection coating. As well as eliminating the optical low-pass filter, to improve light collection and enhance detail. Also, the copper wiring layer dramatically improves data transmission speed for creating 14-bit, high-resolution 61MP stills. With a native sensitivity range from ISO 100-32000, which can be further expanded to ISO 50-102400. Also, it enables internal UHD 4K video recording with a wide 14-stop dynamic range. This is using either the full width of the full-frame sensor or an APS-C-sized area.
Finally, the sensor and processor avails continuous shooting at up to 10 fps at full resolution. For up to 68 consecutive frames, with full-time AF/AE.
Fast Hybrid AF System
An updated Fast Hybrid AF system now employs a combination of 567 phase-detection points. This covers approximately 99.7% of the height and 74% of the width of the frame. In addition, 425 contrast-detection areas for reliable and quick autofocus and subject tracking performance. This focusing system also achieves especially quick speed and reliable tracking. The use of phase-detection points also enables the use of A-mount lenses. This is with the optional LA-EA3 or LA-EA1 lens mount adapters.
Additionally, Eye Auto focus can be used to base focus on recognised human subjects’ eyes. This is available in both AF-S and AF-C modes, for both stills and video. Autofocus can also be used in conjunction with the Focus Magnifier function. Thus providing critical focus when homing in on minute subject details. The rear touchscreen can also be used for Touch Focus control. Touchpad Focus Control mode lets you use the rear screen intuitively while keeping your eye to the viewfinder.
Other Inputs and Features
The a7R IV also features a 3.5mm microphone input jack for compatibility with external microphones. Built-in Wi-Fi enables the a7R IV to instantly share imagery to mobile devices for direct sharing online to social networking. Support for both 2.4 and 5.0 GHz bands also enables wireless tethered shooting support. NFC (Near Field Communication) provides a one-touch connection between the camera and compatible mobile devices. Thus, simplifying set-up. The linked mobile device can also display a live view image on its screen and remotely control the camera’s shutter.
Bluetooth connectivity allows for location data acquisition.
Support for HDR Content:
Sony’s A7R IV allows users to adjust the gamma, black level, knee, color level, and more. Also, users can use the same S-Log2 Gamma Curve that is found on high-end Sony Cinema cameras. Thus squeeze up to 1300% more dynamic range into the video signal then traditional REC709. HLG (Hybrid Log-Gamma) support is also available, along with the BT.2020 color space. In addition to S-Log2, S-Log3 is also available for producing an effective 14-stop dynamic range.
Slow & Quick Motion:
Take more control over your video capture capabilities with a variety of new frame rates available in an S&Q mode. This will allow shooters to capture Full HD video at one of either steps between 1-120 fps. These settings will allow you to slow down action as well as speed up a slow-moving scene. This setting is also NTSC/PAL switchable.
Enhanced Zebra Function:
An enhanced Zebra function aids monitoring exposure values in high-contrast scenes. Video signal level targets range from 0 to 109. Thus, simplifying exposure level adjustments.
Time Code and User Bit Settings:
Time code records hours, minutes, seconds, frames on image data. This enables precise editing. The User Bit function can record date, time, and scene number to aid in editing together footage from multiple cameras.
UHD 4K movies and lower-resolution proxy movies can be simultaneously recorded. The smaller proxy files are ideal for quick previewing or pre-editing. Thus reducing the time required for final 4K editing.