Sony E 50mm F1.8 OSS — Bokeh & Optical Ray-Tracing Simulator

Interactive 3D portrait ray-traced through the published JP2012-242690A optical prescription (9 elements in 8 groups) with a 27.8 mm entrance pupil and 0.39 m minimum focus.

Loading scene…

Optical & Portrait Specifications (Upper Body Framing)

Optical & Portrait Metric	Measured / Patent Value	What It Means in Practice
Patent Prescription	JP2012-242690A · 9 elements in 8 groups	Traced surface by surface in WebGL2
Entrance Pupil Diameter	27.8 mm (at f/1.8)	Controls distant background blur disc size
Upper-Body Working Distance	3.06 m	Camera-to-subject distance for head-to-waist framing
Effective Focal Length (Breathing)	51.0 mm (+1.9%)	Actual framing focal length at portrait distance
Depth of Field (Sharp Zone)	39 cm (2.88 m – 3.27 m)	Sharp zone at wide-open aperture
Minimum Focus Distance	0.39 m	Closest focusing distance from the sensor

Questions

How much background blur does the Sony E 50mm F1.8 OSS produce?

Wide open at f/1.8, the Sony E 50mm F1.8 OSS has a 27.8 mm entrance pupil (50 mm ÷ 1.8). In an upper-body portrait at 3.06 m, the sharp depth-of-field zone spans 39 cm (2.88 m to 3.27 m), while mechanical vignetting and 9 glass elements shape the out-of-focus highlights.

Does the Sony E 50mm F1.8 OSS show focus breathing at portrait distance?

Based on patent JP2012-242690A, tracing the focusing group at 3.06 m gives an effective framing focal length of 51.0 mm (+1.9% 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 Sony E 50mm F1.8 OSS?

The patent prescription (JP2012-242690A) specifies 9 lens elements in 8 groups. The interactive Optical X-Ray above traces rays through every surface in real time.

Head-to-head patent comparisons with Sony E 50mm F1.8 OSS

Related comparisons

All lens comparisons

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