No, the DJI RS 4 Mini is not compatible with the Sony FX3.
Sony FX3 body weighs 715g (with battery+card, per Sony's own Help Guide). Paired with a Sony FE 200-600mm G OSS telephoto lens (2,115g / 74.7oz, per Sony's own spec page) -- a common real-world FX3 lens for wildlife/sports work -- combined weight is ~2,830g. DJI RS 4 Mini's stated payload capacity is 2kg (4.4lbs) per DJI's own product page. 2,830g exceeds that capacity by over 40%; the gimbal cannot safely balance or support this combination.
Conditions for compatibility
Verdict assumes a Sony FE 200-600mm G OSS telephoto lens (2,115g, per Sony's own spec page) -- a common real-world FX3 lens for wildlife/sports work. FX3 body (715g) + this lens = ~2,830g, exceeding DJI RS 4 Mini's 2kg (4.4lbs) payload capacity by over 40%. Body-only or a lighter lens may fit within the limit -- check your specific lens weight before assuming this pairing won't work. See this camera's DJI RS 4 pairing for a gimbal that does fit this exact lens.
What works instead
See all compatible gimbal for the DJI RS 4 Mini →“Mass (Approx.) 715 g (1 lb 9.3 oz) (including battery pack, SD card)”
“Size and Weight 4.5 x 12.625 in. / 74.7 oz.”
“2kg/4.4lbs Payload for Camera and Phone It supports a wide range of mainstream mirrorless cameras and lens combinations, lightweight vlog cams,”
Last verified:
High confidence