James Emery at Backscatter has published a review and a field video of three Nauticam wet lenses that mount on the same macro port: the MFO-1, the SMC-3, and the MFO-3II.
All three are 67mm lenses, so on a flip holder you can move among them on one dive without changing the camera lens. They do different jobs. The MFO-1 is the everyday optic: a little magnification, and a shorter focus range so autofocus stops hunting the water column. The SMC-3 is the super-macro lens, about 2.3:1, for the smallest subjects. The MFO-3II opens a 90mm, 100mm, or 105mm toward a 60mm view, which is the one for larger subjects and blackwater.
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