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Sigma 135mm F1.4 DG | Art — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US 2026/0086332 A1 optical prescription (17 elements in 13 groups, 4 aspherical) with a 96.4 mm entrance pupil and 1.1 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US 2026/0086332 A1 · 17 elements in 13 groups (4 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 96.4 mm (at f/1.4) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 62% at f/1.4 (≥86% from f/2.8) · -0.8 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 15° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 5.40 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 141.2 mm (+4.6%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 20 cm (5.31 m – 5.50 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 1.1 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Sigma 135mm F1.4 DG | Art produce?
Wide open at f/1.4, the Sigma 135mm F1.4 DG | Art has a 96.4 mm entrance pupil (135 mm ÷ 1.4) and 62% bokeh roundness in the 90% corner (-0.8 EV corner falloff, reaching ≥86% roundness from f/2.8). In an upper-body portrait at 5.40 m, the sharp depth-of-field zone spans 20 cm (5.31 m to 5.50 m) with a 15° horizontal background angle of view.
Does the Sigma 135mm F1.4 DG | Art show focus breathing at portrait distance?
Based on patent US 2026/0086332 A1, tracing the focusing group at 5.40 m gives an effective framing focal length of 141.2 mm (+4.6% 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 Sigma 135mm F1.4 DG | Art?
The patent prescription (US 2026/0086332 A1) specifies 17 lens elements in 13 groups with 4 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Sigma 105mm F1.4 DG HSM | Art
- 35mm vs 135mm focal length comparison
- 50mm vs 135mm focal length comparison
- 70mm vs 135mm focal length comparison
- 85mm vs 135mm focal length comparison
- 105mm vs 135mm focal length comparison
Compare with similar portrait lenses
- Sony FE 135mm F1.8 GM
- Nikon NIKKOR Z 135mm f/1.8 S Plena
- Canon RF 135mm F1.8 L IS USM
- Pentax SMC Pentax-A* 135mm f/1.8
- Nikon NIKKOR 135mm f/2 AI-s
- Nikon 200mm f/2 VR II FX
Also see: depth of field, bokeh, crop factor, lens compression.