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Sony E 35mm F1.8 OSS — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published JP2014-089352A optical prescription (9 elements in 6 groups, 3 aspherical) with a 19.4 mm entrance pupil and 0.3 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2014-089352A · 9 elements in 6 groups (3 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 19.4 mm (at f/1.8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 74% at f/1.8 (≥86% from f/2.8) · -0.5 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 37° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 2.15 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 35.3 mm (+0.9%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 40 cm (1.97 m – 2.37 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.3 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Sony E 35mm F1.8 OSS produce?
Wide open at f/1.8, the Sony E 35mm F1.8 OSS has a 19.4 mm entrance pupil (35 mm ÷ 1.8) and 74% bokeh roundness in the 90% corner (-0.5 EV corner falloff, reaching ≥86% roundness from f/2.8). In an upper-body portrait at 2.15 m, the sharp depth-of-field zone spans 40 cm (1.97 m to 2.37 m) with a 37° horizontal background angle of view.
Does the Sony E 35mm F1.8 OSS show focus breathing at portrait distance?
Based on patent JP2014-089352A, tracing the focusing group at 2.15 m gives an effective framing focal length of 35.3 mm (+0.9% 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 E 35mm F1.8 OSS?
The patent prescription (JP2014-089352A) specifies 9 lens elements in 6 groups with 3 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Sony E 30mm F3.5 Macro
- 35mm APS-C vs 50mm full frame focal length comparison
- 33mm APS-C vs 50mm full frame focal length comparison
- 24mm vs 35mm focal length comparison
- 28mm vs 35mm focal length comparison
- 35mm vs 40mm focal length comparison
Compare with similar portrait lenses
- Nikon 35mm f/1.8 DX
- Sony FE 35mm F1.8
- Fujifilm XF 35mm F2 R WR
- Sony AF 35mm F2
- Sony Hexar 35mm F2
- Nikon 28mm f/1.4E FX
Also see: depth of field, bokeh, crop factor, lens compression.