Yes, the DJI RS 4 works with the Sony Alpha A9 III — but only Verdict assumes a Tamron 150-500mm F5-6.7 Di III VC VXD.
DJI RS 4's stated payload capacity is 3kg (6.6lbs) per DJI's own product page -- the highest of the three gimbals in this category. Sony A9 III (703g) + Tamron 150-500mm (1,725g) = ~2,428g, fitting within that capacity where the same combination exceeds both the RS 3 Mini and RS 4 Mini's 2kg limits. 'What works instead' pairing for A9 III owners using this telephoto lens.
Conditions for compatibility
Verdict assumes a Tamron 150-500mm F5-6.7 Di III VC VXD lens (1,725g for Sony E-mount, per Tamron's own product page). A9 III body (703g) + this lens = ~2,428g, within DJI RS 4's stated 3kg (6.6lbs) payload capacity with reasonable margin. Check your specific lens weight against the 3kg limit before buying.
“Mass (Approx.) 703 g (1 lb 8.8 oz) (including battery pack, SD card)”
“Weight 1,725g/60.8oz (w/o tripod mount) (Sony), 1,710g/60.3oz (w/o tripod mount) (Fujifilm), 1,720g/60.7oz (w/o tripod mount) (Nikon), tripod mount 155g/5.5o”
“3kg (6.6lbs) Payload Capacity With Extended Tilt Axis”
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Confidence: high confidence