HDMI Cable Clamp for A7S III Cage

SmallRig HDMI Cable Clamp for A7S III Cage — Protect Your External Recording Feed on the Move

The gist: A 34 g aluminum accessory that secures the HDMI cable in a Sony A7S III cage rig, preventing accidental disconnection during run-and-gun travel video — exactly the failure mode that ruins footage mid-shoot.

• Locks HDMI in place: Attaches to the SmallRig A7S III cage via ¼”‑20 screw and two anti-twist pins, with a sliding block that clamps down on the cable to prevent accidental yanks from disconnecting the external recording signal.
• Variable cable diameter: The knurled ¼”‑20 screw adjusts a sliding block to fit HDMI cables of different diameters — works with slim micro-HDMI cables and standard full-size HDMI adapters.
• 34 g aluminum alloy: Adds almost no weight to an already cage-heavy rig — relevant when minimizing carry weight on travel shoots.
• Fits A7S III, A7R V, and A7 IV cages: Compatible beyond just the A7S III, protecting the investment if you upgrade or cross-use cage rigs on different Sony body generations.

According to the SmallRig product page, the clamp is purpose-built for the brand’s own A7S III cage (model 2999), with ¼”‑20 thread and anti-twist pins specifically sized to the cage’s side rail attachment points.

Best for: Sony A7S III travel videographers who record to an external monitor or recorder over HDMI and need cable security during active, moving shoots. Skip it if: you record exclusively to the internal card or use a different cage brand with a different cable management system. Runs ~$15 — check the current price before buying.