The housing for the Sony a1 is built around Isotta's B120 port system with 120mm bayonet, and comes with Isotta's classic features: anodized aluminium construction, integrated adjustable handles, double O-ring seals on buttons and removable parts, Isotta’s signature one-handed open/close, and a built-in moisture detector.

There’s a large-bore M28 port for attaching recorders/monitors such as the Atomos Ninja V or Ninja V+. The housing has two fibre-optic ports as standard with Nikonos N5 or S6 bulkheads as extra options.