HDMI Cable Clamp for A7S III Cage

SmallRig HDMI Cable Clamp for A7S III Cage — Client-Shoot Insurance for $15

The gist: A purpose-built cable lock for Sony A7S III cage rigs that prevents the HDMI connection to an external recorder from pulling free mid-shoot — the kind of failure that can’t be re-shot on a client event or interview day.

• Prevents the worst outcome: Secures the HDMI cable with a knurled screw block and two anti-twist pins so vibration, bag bumps, or cable stress during a live event or corporate shoot can’t disconnect the external recording signal.
• Variable cable clamping: Sliding block accommodates different HDMI cable diameters — switch between a slim capture card cable and a standard monitor HDMI without replacing the clamp.
• 34 g aluminum build: Lightweight and sturdy; aluminum alloy construction won’t deform or loosen under repeated use across event and interview shoots.
• Cross-body compatibility: Fits SmallRig cages for the A7S III, A7R V, and A7 IV — useful for production houses that rotate multiple Sony bodies under the same cage ecosystem.

SmallRig designed the clamp specifically for their A7S III cage (model 2999), using a ¼”‑20 thread mount with anti-twist pins sized to that cage’s side rail — a sign this is a first-party fit rather than a universal afterthought.

Best for: Professional videographers using Sony A7S III rigs for client events, corporate interviews, or documentary work where external recording over HDMI is mission-critical. Skip it if: you record to internal media only or use a cage from a different manufacturer. Runs ~$15 — check the current price before buying.