Nikon AF-S 50mm f/1.4G — Bokeh & Optical Ray-Tracing Simulator

Interactive 3D portrait ray-traced through the published JP2015-041003A optical prescription (9 elements in 7 groups) with a 35.7 mm entrance pupil and 0.45 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	JP2015-041003A · 9 elements in 7 groups	Traced surface by surface in WebGL2
Entrance Pupil Diameter	35.7 mm (at f/1.4)	Controls distant background blur disc size
Upper-Body Working Distance	2.01 m	Camera-to-subject distance for head-to-waist framing
Effective Focal Length (Breathing)	50.1 mm (+0.1%)	Actual framing focal length at portrait distance
Depth of Field (Sharp Zone)	20 cm (1.92 m – 2.12 m)	Sharp zone at wide-open aperture
Minimum Focus Distance	0.45 m	Closest focusing distance from the sensor

Questions

How much background blur does the Nikon AF-S 50mm f/1.4G produce?

Wide open at f/1.4, the Nikon AF-S 50mm f/1.4G has a 35.7 mm entrance pupil (50 mm ÷ 1.4). In an upper-body portrait at 2.01 m, the sharp depth-of-field zone spans 20 cm (1.92 m to 2.12 m), while mechanical vignetting and 9 glass elements shape the out-of-focus highlights.

Does the Nikon AF-S 50mm f/1.4G show focus breathing at portrait distance?

Based on patent JP2015-041003A, tracing the focusing group at 2.01 m gives an effective framing focal length of 50.1 mm (+0.1% vs. the nominal 50 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.

What optical design is inside the Nikon AF-S 50mm f/1.4G?

The patent prescription (JP2015-041003A) specifies 9 lens elements in 7 groups. The interactive Optical X-Ray above traces rays through every surface in real time.

Head-to-head patent comparisons with Nikon AF-S 50mm f/1.4G

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