Nauticam Midrange Focus Optimizer (MFO-3)

Mike Bartick · Issue 146, Sep/Oct 2025 · pp. 32–36

Products mentioned: Nauticam MFO-3, Nikon Z8, Nikon AF-S 105mm f/2.8, Nikon Z 105mm f/2.8

The MFO-3 is a wet lens and the latest version of mid-range focus optimizers, which debuted at the 2024 DEMA show with the release of the MFO-1. Mainly designed to correct optical anomalies in various native lenses and lens port matchups, and to enhance overall performance when shooting at mid-range distances, the MFO-3 further builds on this innovative concept by offering several advantages and additional features that boost its predecessor’s capabilities, but in distinctly different ways. I had my first chance to use the MFO-3 during a recent trip to South Australia. I took it into my possession in Hong Kong while traveling to SA, where we briefly discussed the new lens, engineering, and what to expect when using it. The lens slipped easily into an already tight camera bag, and I continued my trip with this conceptually new and secret device. Winter conditions prevailed in SA, bringing…