The Sony Alpha a7R IV is a full-frame mirrorless digital camera that is designed for professional-level photography. The camera body is sold separately from lenses, so you can choose the lens that best suits your needs. The a7R IV features a 61-megapixel full-frame back-illuminated Exmor R CMOS sensor that produces stunningly detailed images. It also has a high-speed BIONZ X image processing engine that provides fast performance and low noise at high ISO settings. The camera has an advanced autofocus system with 567 phase-detection autofocus points that cover 74% of the image area, ensuring precise and accurate focus. It also has a 5-axis in-body image stabilization system that compensates for camera shake and provides up to 5.5 stops of stabilization. The a7R IV is capable of shooting full-frame 4K video at up to 30 frames per second, and has a range of advanced video features, such as S-Log3 and HLG picture profiles, focus peaking, and zebra patterns. Other features of the Sony Alpha a7R IV include a 5.76 million dot OLED electronic viewfinder, a tilting LCD touchscreen, built-in Wi-Fi and Bluetooth connectivity, and dual memory card slots that support UHS-II SD cards. Overall, the Sony Alpha a7R IV is a powerful and versatile camera that is designed for professional-level photography and video production. Its advanced features, high-resolution sensor, and fast performance make it a great choice for anyone looking for a top-of-the-line mirrorless camera.