Lens Macro (67 mm) Nauticam MFO-3 (0.9x magnification)

Lens Macro (67 mm) Nauticam MFO-3 (0.9x magnification)

Mid-range Focus Optimizer 3 (MFO-3)

Nauticam once again demonstrates its commitment to underwater photographers with the introduction of the Mid-range Focus Optimizer 3 (MFO-3). As full-frame mirrorless cameras become the go-to choice for serious underwater imaging, a key limitation has emerged: the lack of close-focusing, wide-angle macro lens options—especially for blackwater photography. The MFO-3 is designed to solve that problem without requiring new camera lenses or ports.

Key Features

• Focal length conversion: Converts longer macro lenses (90–105 mm) to an effective focal length of around 60 mm, expanding the field of view from 23° to 38°.
• Working distance: From 0 mm up to approx. 1500 mm – ideal for subjects ranging from tiny nudibranchs to larger creatures like frogfish.
• Maximum magnification: Up to 0.9× (tested with Nikon Z 105 mm macro lens).
• Lightweight underwater: Only –120 g negative, lighter than the SMC‑3 and easier to maneuver.

Optimized for use with longer focal length full-frame macro lenses (such as 90mm, 100mm, and 105mm), the MFO-3 transforms these lenses into an approximate 60mm equivalent. It also delivers significantly enhanced "focus-to-the-glass" performance while still offering ample working distance when needed. Whether you're capturing thumbnail-sized nudibranchs or grapefruit-sized frogfish, this water-contact optic delivers outstanding image quality—without the need to swap out your camera lens or port.

While it's an outstanding tool for blackwater, the MFO-3 is just as capable in a wide range of macro environments. And despite its larger physical size, it actually boasts a lower in-water weight than the SMC-3, making it easier to handle and balance in the water.

Technical Specifications

• Dimensions: Ø 84 mm × Height 114.2 mm
• Weight (in air): 602 g
• Underwater Buoyancy: –120 g (negatively buoyant)
• Maximum Magnification: 0.9×*
• Field of View: Native 23° / Converted 38°
• Working Distance: 0 to 1500 mm*
• Housing Material: Hard-anodized aluminum alloy
• Optical Construction: 4 elements in 3 groups
• Lens Coating: Multi-layer anti-reflection coating
• Mount Type: M67 threaded front
• Depth Rating: 100 m

*Tested with Nikon Nikkor Z MC 105mm f/2.8 VR S Macro Lens

In the Box

• Front and rear rubber caps
• Neoprene bag
• M67 Spacer ring for SMC/CMC
• Cleaning cloth