Sony's 61MP high-resolution flagship with Real-time Eye AF and outstanding dynamic range.
The Sony Alpha A7R IV was announced in July 2019 and released in September 2019 as the fourth-generation A7R, featuring a 61MP back-side illuminated full-frame sensor — the highest resolution available in a full-frame mirrorless camera at launch. Real-time tracking and real-time Eye AF algorithms from the A9 were applied to the 61MP platform, providing subject tracking that the A7R III's contrast-detect-heavy approach could not match at this resolution.
The 61MP full-frame BSI Exmor R CMOS sensor pairs with dual BIONZ X processors. The 567-point phase-detection AF covers the frame with Real-time Eye AF and subject tracking. Burst shooting runs at 10fps. 4K video records from the full sensor area. The 5-axis IBIS is built in. Battery life approximately 530 shots via EVF and 660 shots via LCD using the NP-FZ100, body weight approximately 665g with battery and card, dual card slots (one SD UHS-II and one SD UHS-I).
The 61MP practical case is large-format print and substantial post-production cropping: at 61MP a significant portion of the frame can be cropped while retaining high-resolution output. For landscape, architecture, and commercial studio photography where every pixel contributes to the final image, the 61MP platform provides a capability ceiling that lower-resolution sensors cannot reach. Real-time Eye AF extended the A7R's usability to portrait sessions with moving subjects.
The A7R IV holds value as Sony's resolution standard for the FE system. Condition checks: IBIS operation, both card slot contacts, and sensor for dust — at 61MP dust spots are proportionally more visible. The NP-FZ100 battery is shared across the A7S III, A9 II, A7R V, and A6700. The A7R V (2022) added the AI Processing Unit and improved tracking over the A7R IV at a higher price. Compatible with all Sony FE-mount full-frame and APS-C E-mount lenses.