Sony today announced the A7R IV, its latest and most advanced full-frame mirrorless camera yet.

The camera delivers “medium-format image quality” with the help of a new 61-megapixel sensor, according to Sony.

This camera’s predecessor, the A7R III, features a 42.4-megapixel sensor. Sony says the new sensor enables an extraordinary level of detail.

The camera has a full-frame 61MP BSI-CMOS sensor with a claimed 15 stops of dynamic range (it's the first new sensor since 2015, according to Sony). It has a hybrid AF system with 567 PDAF and 425 contrast-detect point, and 74% frame coverage. There's also real-time eye, human and animal AF. The camera can shoot at 10 fps with continuous AF for up to 68 photos.

The A7R IV has five-axis image stabilization. Sony is also upgrading the audio recording capabilities in the A7R IV with a new system that captures a digital audio signal.

Other improvements include a redesigned grip, enhanced resistance against dust and moisture, and dual UHS-II SD card slots.

The body has been redesigned, with upgraded weather-sealing, a new grip and repositioned buttons. There's also a 5.76M-dot EVF, dual UHS-II card slots and USB-C. The camera also has 802.11ac Wi-Fi plus Bluetooth.

The a7R IV uses the NP-FZ100 battery, which can take approximately 670 shots using the LCD and 530 using the EVF, based on CIPA standard testing. A battery grip, which holds two FZ100s, is priced at $400.

If you drop down to APS-C crop mode you get 26 Megapixel images, with near-total-frame AF coverage and 325 PDAF points.

The Pixel Shift mode can captures 960 Megapixels worth of data by compositing 16 images, which can be processed via Sony's Imaging Edge software to create 240MP photos.

The a7R IV can capture oversampled 4K/30p video with touch tracking and real-time Eye AF, and support for 8-bit S-Log2/3 and HLG. When using the Super 35 crop there is an additional 1.2x crop at 30p and 1.1x at 24p. As with its predecessor, the top bit rate is 100Mbps using XAVC S.

The A7R Mark IV will be released in September for $3,500. The new ECM-B1M Shotgun Microphone will ship in September 2019 for approximately $350 US. The new XLR-K3M XLR Adapter Kit will ship in October 2019 for approximately $600 US.