Sony's revised A7R III — minor LCD update over original, same 42.4MP sensor.
The Sony Alpha A7R III A (ILCE-7RM3A) was released approximately 2021 as a minor hardware revision of the A7R III, with the sole change being an upgraded rear LCD panel with higher resolution. All other hardware — sensor, AF, IBIS, video — is identical to the A7R III. Sony FE mount.
42.4MP full-frame BSI CMOS sensor (same as A7R III). 399-point phase-detect AF. 4K/30fps video. 5-axis IBIS (5 stops). Dual SD card slots (UHS-II in first slot). At approximately 657g. Upgraded 3.69M-dot rear LCD (versus 1.44M-dot in original A7R III). Sony FE mount.
The A7R III A's sole hardware differentiation from the A7R III is the higher-resolution rear LCD — 3.69M dots versus 1.44M in the original. This mirrors the parallel A7R IVA (61MP, IV-series) revision, but the A7R III A is the 42MP III-series body. In all other respects — sensor, processing, AF, IBIS, video, battery — the A7R III A and A7R III are identical.
On the used market the Sony A7R III A typically commands a slight premium over the original A7R III due to the improved LCD, though the hardware difference is minimal. Condition checks: LCD condition (the sole differentiating feature), shutter actuation count, dual SD slot contacts, battery health (NP-FZ100). Sony FE mount — full-frame.