Sony did specifically mention floating focus for the f/4.5 version of the 100-400.
From Sony about 100-400/4.5:
Four custom-optimized XD (extreme dynamic) Linear Motors, a floating focus mechanism, and the latest AF algorithms deliver AF speeds up to 3x faster [than the Sony FE 100-400mm F4.5-5.6 GM OSS Lens] with approximately 50% improved subject tracking. Fully compatible with Alpha 9 III continuous shooting at up to 120 fps with AF/AE tracking
If the FE 100-400mm F5.6-8.0 OSS has floating elements its surprising to me that the close focus performance is so shit in spite of the floating elements.
Sony did specifically mention floating focus for the f/4.5 version of the 100-400.
If the FE 100-400mm F5.6-8.0 OSS has floating elements its surprising to me that the close focus performance is so shit in spite of the floating elements.
It's here on the Sony website under "Specifications." Focusing type is listed as internal. You can also see it videos where they show it focusing. It only extends to zoom.
