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Sony FE 135mm F1.8 GM — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published WO2019187633A1 optical prescription (13 elements in 10 groups, 1 aspherical) with a 75.0 mm entrance pupil and 0.7 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | WO2019187633A1 · 13 elements in 10 groups (1 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 75.0 mm (at f/1.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 5.40 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 130.8 mm (-3.1%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 25 cm (5.28 m – 5.53 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.7 m | Closest focusing distance from the sensor |
Questions
How much background blur does the Sony FE 135mm F1.8 GM produce?
Wide open at f/1.8, the Sony FE 135mm F1.8 GM has a 75.0 mm entrance pupil (135 mm ÷ 1.8). In an upper-body portrait at 5.40 m, the sharp depth-of-field zone spans 25 cm (5.28 m to 5.53 m), while mechanical vignetting and 13 glass elements shape the out-of-focus highlights.
Does the Sony FE 135mm F1.8 GM show focus breathing at portrait distance?
Based on patent WO2019187633A1, tracing the focusing group at 5.40 m gives an effective framing focal length of 130.8 mm (-3.1% vs. the nominal 135 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Sony FE 135mm F1.8 GM?
The patent prescription (WO2019187633A1) specifies 13 lens elements in 10 groups with 1 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Head-to-head patent comparisons with Sony FE 135mm F1.8 GM
- Sony FE 135mm F1.8 GM vs. Sony FE 85mm f/1.8
- Sony FE 135mm F1.8 GM vs. Sony FE 85mm F1.4 GM II
- Sony FE 135mm F1.8 GM vs. Nikon NIKKOR Z 135mm f/1.8 S Plena
- Sony FE 135mm F1.8 GM vs. Canon RF 135mm F1.8 L IS USM
Related comparisons
- Nikon NIKKOR Z 135mm f/1.8 S Plena
- Canon RF 135mm F1.8 L IS USM
- Nikon AF DC 135mm f/2D
- Canon 135mm f/2 L
- Nikon 105mm f/1.4 FX
- Nikon NIKKOR Z 85mm f/1.2 S
Also see: depth of field, bokeh, crop factor, lens compression.