Nauticam MFO-1 Mid-range Focus Optimizer 1

Part #: Nau-81501

The Mid-range Focus Optimizer 1 (MFO-1) is Nauticam’s newest Water Contact Optic, designed for macro shooters who want more dependable autofocus performance and better overall image quality underwater. In real-world use, the Nauticam MFO-1 helps reduce noticeable focus hunting while producing images that look sharper, cleaner, and more vibrant.

For photographers working with macro subjects at varying distances, the mfo-1 offers a meaningful improvement in both usability and optical performance. Rather than fighting the limitations of a flat port setup, you get a more refined focus range, improved clarity, and a setup that feels more responsive when the moment matters.

Why the MFO-1 Stands Out

Sharper, higher-quality images
The MFO-1 is designed to improve image quality by reducing the optical compromises commonly associated with flat ports. The result is better clarity, more accurate color, and improved sharpness through the reduction of lens aberrations.

Less focus hunting, more consistent autofocus
One of the biggest advantages of the Nauticam MFO-1 is how it improves focusing behavior. By optimizing the working focus range of your lens, it helps eliminate noticeable focus hunting (which is one of the most frustrating aspects of macro photography) and thus allows for smoother, more precise focus acquisition, even in challenging surgy underwater conditions.

A more useful macro focus range
When paired with the Nikon AF-S VR Micro-NIKKOR 105mm f/2.8G IF-ED, the mfo-1 converts the focus range to approximately 12.5 cm to 114 cm. That added flexibility makes it easier to work with subjects that are not locked into one exact shooting distance, are constantly moving, or your camera housing and lens are moving with the water movement.

Increased magnification for more detail
For close-up and super-macro photographers, the MFO-1 also adds a useful boost in magnification. With the Nikon AF-S VR Micro-NIKKOR 105mm f/2.8G IF-ED, magnification reaches up to 1.2x at minimum focus distance. Paired with the Canon RF 100mm f/2.8, it can achieve up to 1.6x magnification, giving you even more detail on the smallest subjects.

Bottom Line

The Mid-range Focus Optimizer 1 (MFO-1) is a smart upgrade for macro photographers who want a more polished underwater shooting experience. With better image quality, reduced focus hunting, a more practical focus range, and increased magnification, the Nauticam MFO-1 is built to help you get more out of every dive.

Compatible Lenses:

• Nikon AF-S VR Micro-NIKKOR 105mm f/2.8G IF-ED
  Max. Magnification: 1.2x, Working Range: 12.5cm-114cm
• Nikon AF-S Micro NIKKOR 60mm f/2.8G ED
  Max. Magnification: 1.1x, Working Range: 1.2cm-112cm
• Olympus M. Zuiko Digital ED 60mm f2.8 Macro
  Max. Magnification: 1.1x, Working Range: 5.8cm-112cm

Comparison with Nauticam MFO-3

The Nauticam MFO-1, released as the first mid-range focus optimizer, shares conceptual similarities but differs in performance. The MFO-1 Nauticam offers higher magnification (up to 1.2x) at shorter distances (~12.5 to 114 cm working range), whereas the Nauticam MFO-3 sacrifices a small amount of magnification for greater working flexibility and coverage. Users looking for a macro solution suitable for slightly larger subjects or greater subject distance may choose the Nauticam MFO-3 over the Nauticam MFO-1, depending on their photographic needs.

Recommended Accessories:

• Nauticam Flip Diopter for M67 Macro Port
• Nauticam Double Flip Diopter for M67 Macro Port
• Nauticam M67 Port to Bayonet Mount Converter for Wet Lenses
• Nauticam Bayonet Mount - CMC / SMC Adapter
• 83250 M67 to Bayonet Mount Converter II
• 83251 M77 to Bayonet Converter II
• 86221 M67 Flip holder for MWL-1
• 86222 Double Flip Holder for MWL-1
• 87501 Flip Holder for EMWL