Achtel Limited announces housing for Sigma fp Cinema camera

Achtel Limited has announced their housing for the Sigma fp Digital Cinema Camera. Similar in size and weight to the original Nikonos V camera, the housing has a titanium lens mount that allows the use of Nikonos water contact designed manual focus lenses. It allows for internal and external recording to SSD and has a vacuum valve as standard.

From Achtel Pty Limited

Underwater Housing for Sigma fp Digital Cinema Camera with Nikon Nikonos Lens Mount

Housing Main Features


Superior Design, Professional Features and Small Size.

Achtel Pty Limited has led the industry by designing smallest and lightest underwater housings for digital cimema cameras. Typically our housings are half or even a quarter of the weight and size of comparable housings from other manufacturers. This time the gap has widened. Utilizing innovative materials and technologies we managed to achieve weight and size similar to the legendary Nikonos V camera, but capable of capturing cinema quality motion pictures.


Sigma fp housing features many innovations not found in any other housings.

Sigma fp housing has a precision-machined titanium lens mount assuring perfect back focus and extremely reliable sealing connection with the lens.


Sigma fp housing features true 4k, ultra-wide angle underwater optics utilizing Nikon Nikonos submersible lenses. Nikonos 15mm optics offer the highest optical quality underwater far exceeding that of housed lenses.

This submersible optics assures no distortions, no field curvature, no chromatic aberrations or astigmatism found in flat and dome underwater ports.

Sigma fp housing supports large selection of high-quality submersible lenses, which can be changed in seconds without opening the housing - no custom gears, no extension ports, no alignment, and no hassle.

Nikonos optics offers the highest contrast and sharpness possible in underwater optics far exceeding performance of dome and flat ports traditionally used in underwater housings.

Why use Nikon Nikonos lenses underwater?

Nikonos submersible lenses have been a foundation of underwater photography for over 30 years. Unlike land lenses placed into waterproof ports, Nikonos lenses were specifically designed for the unique optical challenges of underwater imaging. Many professional photographers consider these lenses the sharpest underwater optics ever designed. And rightfully so, as their optical performance does not suffer from the limitations of land lenses placed behind waterproof ports. Dome ports and flat ports, irrespective how good, suffer from inevitable field curvature, distortions and chromatic aberrations. On the other hand, when tested the UW-Nikkor 15mm F/2.8 with Imatest software, it exhibited similar corner sharpness at f/5.6 underwater as Arri Master Prime lens on land - trully remarkable and not possible to achieve by placing even the best land lens behind an underwater port.

RESOLUTION: Chart showing comparative corner resolution of typical underwater camera systems in use today.

Only DeepX and Vanquish Weapon that use Nikon Nikonos lenses reaches the Nyquist frequency limit - the theoretical maximum resolution of the camera sensor. Find out more why Nikonos is the ultimate underwater optics here.

Benefits of using Nikonos lenses underwater:

Compatible Lenses: