Nikon 58mm f/1.2 Noct-NIKKOR — Bokeh & Optical Ray-Tracing Simulator

Interactive 3D portrait ray-traced through the published US4621909A optical prescription (7 elements in 6 groups) with a 48.3 mm entrance pupil and 0.5 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	US4621909A · 7 elements in 6 groups	Traced surface by surface in WebGL2
Entrance Pupil Diameter	48.3 mm (at f/1.2)	Controls distant background blur disc size
Upper-Body Working Distance	2.33 m	Camera-to-subject distance for head-to-waist framing
Effective Focal Length (Breathing)	58.0 mm (-0.0%)	Actual framing focal length at portrait distance
Depth of Field (Sharp Zone)	17 cm (2.25 m – 2.42 m)	Sharp zone at wide-open aperture
Minimum Focus Distance	0.5 m	Closest focusing distance from the sensor

Questions

How much background blur does the Nikon 58mm f/1.2 Noct-NIKKOR produce?

Wide open at f/1.2, the Nikon 58mm f/1.2 Noct-NIKKOR has a 48.3 mm entrance pupil (58 mm ÷ 1.2). In an upper-body portrait at 2.33 m, the sharp depth-of-field zone spans 17 cm (2.25 m to 2.42 m), while mechanical vignetting and 7 glass elements shape the out-of-focus highlights.

Does the Nikon 58mm f/1.2 Noct-NIKKOR show focus breathing at portrait distance?

Based on patent US4621909A, tracing the focusing group at 2.33 m gives an effective framing focal length of 58.0 mm (-0.0% vs. the nominal 58 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.

What optical design is inside the Nikon 58mm f/1.2 Noct-NIKKOR?

The patent prescription (US4621909A) specifies 7 lens elements in 6 groups. The interactive Optical X-Ray above traces rays through every surface in real time.

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