Sony FE 35mm F1.8 — Bokeh & Optical Ray-Tracing Simulator

Interactive 3D portrait ray-traced through the published US20140071333A1 optical prescription (10 elements in 8 groups, 5 aspherical) with a 19.4 mm entrance pupil and 0.22 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	US20140071333A1 · 10 elements in 8 groups (5 aspherical)	Traced surface by surface in WebGL2
Entrance Pupil Diameter	19.4 mm (at f/1.8)	Controls distant background blur disc size
Upper-Body Working Distance	1.42 m	Camera-to-subject distance for head-to-waist framing
Effective Focal Length (Breathing)	34.4 mm (-1.7%)	Actual framing focal length at portrait distance
Depth of Field (Sharp Zone)	26 cm (1.30 m – 1.56 m)	Sharp zone at wide-open aperture
Minimum Focus Distance	0.22 m	Closest focusing distance from the sensor

Questions

How much background blur does the Sony FE 35mm F1.8 produce?

Wide open at f/1.8, the Sony FE 35mm F1.8 has a 19.4 mm entrance pupil (35 mm ÷ 1.8). In an upper-body portrait at 1.42 m, the sharp depth-of-field zone spans 26 cm (1.30 m to 1.56 m), while mechanical vignetting and 10 glass elements shape the out-of-focus highlights.

Does the Sony FE 35mm F1.8 show focus breathing at portrait distance?

Based on patent US20140071333A1, tracing the focusing group at 1.42 m gives an effective framing focal length of 34.4 mm (-1.7% vs. the nominal 35 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.

What optical design is inside the Sony FE 35mm F1.8?

The patent prescription (US20140071333A1) specifies 10 lens elements in 8 groups with 5 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.

Head-to-head patent comparisons with Sony FE 35mm F1.8

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