Nauticam Mid-range Focus Optimizer 3 MFO-3

The Nauticam Mid-range focus optimizer 3 or MFO-3's main function is to cancel the focus distance limitation of macro lenses underwater and provide ample focus distance for different sizes of subjects which were previously limited by using SMC-1 or CMC lenses.  The MFO-3 also greatly improves optical performance by minimising aberration.  Compared to the MFO-1 the new MFO-3 offers an even greater working distance although the maximum magnification is reduced.  

Specification:

• Dimensions: OD 84mm × H 114.2 mm
• Weight in air: 602g
• Buoyancy in water: Negative 120g
• Lens FOV/Converted FOV (*¹): 23°/38°
• Max. 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: M67
• Depth rating: 100m

*1.  Tested with Nikon Nikkor Z MC 105mm f/2.8 VR S Macro lens

      Included in box:

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

Comparison with MFO-1, SMC-3

Compatible Lenses with MFO-3 

       Optional Accessories

• 25101 M67 flip diopter holder for M67 macro ports (from SN A614741 onward)
• 25108 M67 Double Flip Holder for M67 Macro Ports (from SN A397071 onward)
• 83214 Bayonet Mount Adaptor for SMC/CMC
• 83250 M67 to Bayonet Mount Converter II
• 87501 Flip Holder for EMWL