Porthole Mark II Lower Lens Assembly

The Submersible Foundation.

The Lower Lens Assembly serves as the main Wet Side interface for the Mark II Modular system and is the crucial starting point for all Porthole configurations.

Designed to reduce optical distortion from surface turbulence and light refraction, it offers a stable, clear window into your reef. The Mark II model introduces a new 100mm architecture, enhancing structural durability and optimizing the internal light path for the best resolution with modern camera sensors.

Key Features

• 100mm MIIM Architecture: Features our proprietary 100mm heavy-duty threading for a secure, tool-free connection to the Mk II ecosystem.
• Optimized Light Path: The internal diameter has been refined to 90mm, better aligning with the profile of modern professional lenses to reduce internal reflections and stray light.
• Zero-Distortion Optics: Premium bonded cast acrylic lens for edge-to-edge clarity and true-to-life color transmission.
• Refined Protection: Includes a two-part protective lens shield and a custom-fitted TPU dust cap.
• Precision Depth Reference: The integrated silicone logo band at the 4-inch mark provides a subtle, functional waterline guide during your shoot.
• Rapid Evacuation Design: Internal air chambering enables near-instant air evacuation upon submersion, ensuring that no trapped bubbles ruin your shot.
• Lightweight Engineering: The Advanced MIIM architecture reduces overall weight by 20% compared to the original (now just 270g or 9.5oz), putting less strain on your lens's autofocus motor and mount.

Includes Mark II Lower Lens Assembly and Universal Dust Cap.