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Nauticam Mid-range Focus Optimizer 3 (MFO-3/MFO-3II)

https://www.seatech.co.nz/web/image/product.template/29295/image_1920?unique=4093b3f

$ 1,222.99 1222.99 NZD $ 1,222.99

$ 1,063.47

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Manufacturer: Nauticam
Port Fitting: M67

Stock Code: NAU-81503

Introducing our newest Water Contact Optic, the Mid-range focus optimizer or MFO-3. The MFO-3 is designed to elevate your macro shooting experience by eliminating any noticeable focus hunting while ensuring crisper, sharper and more vibrant images.

Check compatible lenses on the MFO-3 Chart, under Optics on the Port Charts page.

*As of September 2026: the design and physical dimension for MFO-3 now have changed due to material shortage on the first version. The new design (SN starts from A680120) has the same functionality as the first design. Regarding repairs, the front element remains interchangeable between the two designs. The main differences lie in the height of the lens, internal element, and the rear element, which have been updated to accommodate the material constraints. The new version is the MFO-3II.

In the Box

  • Front and rear rubber caps
  • Neoprene bag
  • M67 Spacer ring
  • Cleaning cloth

Comparison with MFO-1 and SMC-3

81503 MFO-3 81501 MFO-1 81203 SMC-3
Dimensions (OD x H mm) Ø 84 x 114.2mm Ø 70 x 26mm Ø 70 x 32mm
Weight in air 602g 218g 307g
Buoyancy in water Negative 120g Negative 150g Negative 215g
Lens FOV / Converted FOV(*1) 23°/38°
Max. Magnification (*1) 0.9X 1.2X 2.3X
Working distance (*1) 0-1500mm 108-1005mm 46-98mm
Lens construction 4 elements in 3 groups 3 elements in 2 groups 3 elements in 2 groups
Lens coatings Anti-reflection Anti-reflection Anti-reflection
Mount thread M67 M67 M67
Depth rating 100m 100m 100m
*1. Tested with Nikon Nikkor Z MC 105mm f/2.8 VR S Macro lens

Compatible Lenses (More coming soon)

Lens Sensor format Lens FOV. Max. Magnification Working distance Converted FOV.
Canon RF 100mm f/2.8 L Macro IS USM (with Modified Aperture) FF 24° 0.9X 0-1490mm 40°
Canon EF 100mm f/2.8L Macro IS USM FF 24° 0.9X 0-1490mm 40º
Nikon NIKKOR Z MC 105mm f/2.8 VR S Macro FF 23° 0.9X 0-1500mm 38°
Nikon AF-S VR Micro-NIKKOR 105mm f/2.8G IF-ED FF 23° 0.8X 5-1490mm 38°
Nikon AF-S Micro NIKKOR 60mm f/2.8G ED DX 26.5° 0.5X 0-1500mm 45º
Sony FE 90mm f/2.8 Macro G OSS FF 27° 0.8X 0-1500mm 45º
Fujifilm GF 120mm f/4 Macro R LM OIS WR Medium Format 25.7° 0.9X 15-1500mm 43º
Olympus M. Zuiko Digital ED 60mm f2.8 Macro M43 20° 0.5X 0-1500mm 33º
OM System M.Zuiko Digital ED 90mm f/3.5 Macro IS PRO(Normal macro mode) M43 14° 0.7X 0-1480mm 23°
Canon EF-S 60mm f2.8 Macro USM APS-C 24.5°


Panasonic Lumix S 100mm f2.8 Macro FF 24°


To be tested later

  • Canon EF-S 60mm f2.8 Macro USM
  • Panasonic LEICA DG MACRO-ELMARIT 45mm F2.8 ASPH. EGA O.I.S.
  • Sigma 105mm F2.8 DG DN Macro Art (FE mount)
  • Panasonic Lumix S 100mm f2.8 Macro (L mount)
  • Sigma 105mm F2.8 DG DN Macro Art (L mount)


Dimensions OD 84mm × H 114.2 mm
Weight in air 602g
Buoyancy in water Negative 120g
Lens FOV / Converted FOV(*1) 23°/38°
Magnification (*1) 0.9x
Working distance (*1) 0-1500mm
Body construction Hard-anodized aluminum alloy
Lens construction 4 elements in 3 groups
Lens coatings Anti-reflection Coating
Mount thread diameter M67
Depth rating 100m
*1 Tested with Nikon Nikkor Z MC 105mm f/2.8 VR S Macro lens

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