Porthole Mark II 2.5" Focal Tuning Extension

Internal Calibration for Professional Optics.

Modularity is central to the Mark II system, and the Focal Tuning Extension is another tool for customizing your rig’s geometry. Whether you're a smartphone creator needing to clear a tall aquarium rim or a studio photographer using a longer 180mm-200mm macro lens, this Dry Side component lets you calibrate the internal volume of the Porthole. By stacking these threaded extensions, you can accurately match the working distance of any lens to the optical window.

• Mobile Reach: Provides 2.5 inches of extra reach for Creator users to clear tall tank rims or equipment while maintaining a comfortable filming angle.
• Focal Tuning: Allows Studio users to adjust the internal length to achieve an extended shot angle or improved alignment with longer-lens barrels.
• High-End Compatibility: Allows you to "tune" the internal length of your system to match the specific minimum focal distance of professional-grade prime lenses.
• MIIM Architecture: Features 100mm male and female MIIM threads, enabling stacking multiple extensions for customized optical paths and long-barrel primes.