Porthole Mark II Prime Interface

The Light-Lock Professional Bridge.

The Prime Interface is a high-performance Dry Side component designed specifically for photographers using dedicated macro lenses. Unlike universal mounts, the Prime Interface offers a direct mechanical connection through the lens's filter threads, turning the Porthole and your glass into a single, integrated optical tool. This interface is ideal for professionals who require the highest level of stability, complete glare elimination, and unobstructed tactile control over their equipment.

• Perfect Focal Alignment: Together with the Porthole Studio, it achieves an exact 12-inch distance between the sensor and the acrylic, matching the minimum focal distance of most 90-100mm Macro Lenses.
• Direct-Thread Stability: Features a bonded aluminum male thread (67mm/62mm) for a rock-solid, vibration-free union.
• Radial Cammed Connection: Features a precisely engineered radial cammed cutout that aligns with the Studio Upper Assembly. This provides a fast, secure mechanical lock that remains perfectly centered at any shooting angle.
• Total Light-Lock Seal: Fully seals the 90mm opening at the top of the Porthole. This creates a completely enclosed "dark chamber" that eliminates top-down glare and light leaks, maximizing contrast.
• Unobstructed Manual Control: Threads directly in front of your lens, keeping your manual focus and lens adjustments completely accessible. Professional shooters get tactile, high-precision control needed for critical macro work without interference from a universal mount.

Prime Interface comes in 62mm and 67mm and includes a universal dust cap, this covers most Macro Lens sizes, a step ring can be used to adapt to other lens rings if needed.