Nikon 105mm f/1.4 FX — Bokeh & Optical Ray-Tracing Simulator

Interactive 3D portrait ray-traced through the published WO2019116563A1 optical prescription (14 elements in 9 groups) with a 75.0 mm entrance pupil and 1 m minimum focus.

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Optical & Portrait Specifications (Upper Body Framing)

Optical & Portrait Metric	Measured / Patent Value	What It Means in Practice
Patent Prescription	WO2019116563A1 · 14 elements in 9 groups	Traced surface by surface in WebGL2
Entrance Pupil Diameter	75.0 mm (at f/1.4)	Controls distant background blur disc size
Upper-Body Working Distance	4.21 m	Camera-to-subject distance for head-to-waist framing
Effective Focal Length (Breathing)	111.5 mm (+6.1%)	Actual framing focal length at portrait distance
Depth of Field (Sharp Zone)	20 cm (4.11 m – 4.31 m)	Sharp zone at wide-open aperture
Minimum Focus Distance	1 m	Closest focusing distance from the sensor

Questions

How much background blur does the Nikon 105mm f/1.4 FX produce?

Wide open at f/1.4, the Nikon 105mm f/1.4 FX has a 75.0 mm entrance pupil (105 mm ÷ 1.4). In an upper-body portrait at 4.21 m, the sharp depth-of-field zone spans 20 cm (4.11 m to 4.31 m), while mechanical vignetting and 14 glass elements shape the out-of-focus highlights.

Does the Nikon 105mm f/1.4 FX show focus breathing at portrait distance?

Based on patent WO2019116563A1, tracing the focusing group at 4.21 m gives an effective framing focal length of 111.5 mm (+6.1% vs. the nominal 105 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.

What optical design is inside the Nikon 105mm f/1.4 FX?

The patent prescription (WO2019116563A1) specifies 14 lens elements in 9 groups. The interactive Optical X-Ray above traces rays through every surface in real time.

Head-to-head patent comparisons with Nikon 105mm f/1.4 FX

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Also see: depth of field, bokeh, crop factor, lens compression.