The Sea Frogs Salted Line is the Sony FX3 underwater housing I’ve been waiting for. I’ve shot a lot of surf and ocean content in Cornwall over the years — swimming out with a cinema camera is always a calculated risk, and the housing you’re in makes all the difference. When Sea Frogs asked me to test the new Salted Line for the FX3 and FX30, I wanted to go through every detail before it ever touched the sea.
This post covers first impressions from the unboxing. The full in-water review follows once it’s been properly tested in real surf conditions. Short version: it’s impressive. Here’s why.
Built for surf. Not just water.
Most underwater camera housings are designed for divers — controlled environments, static shots, predictable conditions. Surf filmmaking is nothing like that. You’re dealing with impact, movement, rapidly shifting light, and waves that don’t wait for you to find your exposure. A housing that only lets you set your camera settings before you swim out just doesn’t work.
The Salted Line FX3 housing gives access to almost all physical camera controls while you’re in the water. That means adjusting ISO, shutter speed, frame rate, and hitting record in real time — not before you paddle out. For anyone producing professional surf content, this is a genuine game-changer.
Bigger rear screen — finally
The most obvious upgrade over the original Sea Frogs FX3 housing is the rear screen window. It’s noticeably larger, and in practice that matters more than it sounds. When you’re swimming in a lineup trying to hold frame and check exposure at the same time, a small porthole is nearly useless. The Salted Line’s larger window makes actually monitoring your shot viable in the water.
Small detail. Big difference.
Button layout redesigned for real conditions
Sea Frogs have reworked the button ergonomics on the Salted Line, and you can feel it straight away. Controls are repositioned to be reachable with one hand while you’re stabilising yourself in the water. The button springs are stiffer too, which reduces accidental presses when a set wave is pushing you around.
These are the kinds of changes that only get made by people who’ve actually filmed in surf. Someone at Sea Frogs clearly has.
HDMI port and external monitor potential
There’s a full HDMI 2.1 port built into the Salted Line housing, which opens up the option for connecting an external monitor or recorder. Sea Frogs don’t currently offer a dedicated waterproof monitor housing to go with it, but having the port there at all is a meaningful addition for professional users. It gives the housing headroom for how workflows evolve.
Pistol grip ready — the right way to shoot surf
The Salted Line is designed around a trigger-style pistol grip handle rather than the traditional tray and arm system. If you’ve used both in the water, you know exactly why this matters. Tray systems are bulky, slow you down, and make it hard to react quickly. A pistol grip keeps the rig compact, fast to manoeuvre, and far easier to manage when conditions get heavy.
It’s a small design decision that signals a bigger understanding of what surf filmmakers actually need.
Depth rating and port options
The housing is rated to 40 metres (130 feet) — far more than needed for surf work, but that margin gives you confidence the seals are properly engineered. Port options include flat ports for standard lens work and dome ports for wider angles. I’ll be testing both, and the full review will cover which performs better for different focal lengths in real ocean conditions.
As with any new housing, it goes through a full pressure test without the camera before anything gets wet.
How underwater housing fits into professional productions
At Salt & Gorse, we produce surf and ocean content for brands and agencies — from London and further afield — who need footage that looks genuinely cinematic, not like an action camera on a pole. That means committing to full-frame cinema cameras in the water, which means the housing has to perform without compromise.
The Salted Line is the most promising underwater option I’ve had my hands on for the Sony FX3. Once tested properly in real surf, I’ll have a much clearer picture of whether it delivers on what the design promises. Everything on the bench suggests it will.
If you’re a filmmaker or videographer looking at underwater options for the FX3 or FX30, check the Sea Frogs Salted Line on Amazon — and watch for the full in-water review coming soon.
What’s next
This is the unboxing and first impressions. Before it goes anywhere near the sea, the housing gets a pressure test without the camera inside. Once that clears and conditions are right, the FX3 goes in.
The full water test will cover real-world performance, image quality through the port, how the controls handle in active surf, and whether the pistol grip setup is as practical in the water as it looks on dry land.
We also produce surf and ocean video content for brands and agencies across the UK — if that’s something you’re looking for, get in touch.