Nauticam MFO-3 Mid-range Focus Optimizer 3

The Nauticam MFO‑3 is an advanced water-contact optic specifically designed for underwater macro photography using full-frame and APS-C mirrorless cameras in underwater housings. As the third generation in the MFO series, it provides photographers with a powerful solution to shoot close-focus macro—especially for blackwater-style subjects—without needing to change 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.

Technical Specifications

What's in the Box?

• MFO‑3 lens
• Front and rear lens caps
• Neoprene protective pouch
• M67 spacer ring (for SMC/CMC compatibility)
• Cleaning cloth

Who is this for?

• Blackwater photographers who want to use long macro lenses for close-focus work without changing ports.
• Macro photographers aiming to shoot both small and larger subjects with a single setup.
• Users of Canon, Nikon, Sony, or Fujifilm mirrorless cameras with full-frame or APS-C sensors.

Conclusion

The Nauticam MFO‑3 is a versatile and robust addition to any underwater macro photography setup. With impressive close-focus capabilities, excellent optical performance, and lightweight underwater handling, it’s a valuable tool for blackwater dives and detailed macro subjects.