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Leica Summilux-M 28mm f/1.4 ASPH. — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20160070086A1 optical prescription (10 elements in 7 groups, 1 aspherical) with a 20.0 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 | US20160070086A1 · 10 elements in 7 groups (1 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 20.0 mm (at f/1.4) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 72% at f/1.4 (≥86% from f/2) · -0.8 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 65° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 1.15 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 28.1 mm (+0.2%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 21 cm (1.05 m – 1.26 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.7 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Leica Summilux-M 28mm f/1.4 ASPH. produce?
Wide open at f/1.4, the Leica Summilux-M 28mm f/1.4 ASPH. has a 20.0 mm entrance pupil (28 mm ÷ 1.4) and 72% bokeh roundness in the 90% corner (-0.8 EV corner falloff, reaching ≥86% roundness from f/2). In an upper-body portrait at 1.15 m, the sharp depth-of-field zone spans 21 cm (1.05 m to 1.26 m) with a 65° horizontal background angle of view.
Does the Leica Summilux-M 28mm f/1.4 ASPH. show focus breathing at portrait distance?
Based on patent US20160070086A1, tracing the focusing group at 1.15 m gives an effective framing focal length of 28.1 mm (+0.2% vs. the nominal 28 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Leica Summilux-M 28mm f/1.4 ASPH.?
The patent prescription (US20160070086A1) specifies 10 lens elements in 7 groups with 1 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Leica Summilux-M 28mm f/1.4 ASPH. vs. Leica Summicron-M 28mm f/2 ASPH.
- Leica Summicron-M 28mm f/2 ASPH.
- Leica Elmarit-M 28mm f/2.8 ASPH.
- Leica ELMARIT-M 24mm f/2.8 ASPH
- Leica Summilux-M 35mm f/1.4
- Leica Summilux-M 35mm f/1.4 ASPH.
Compare with similar portrait lenses
- Nikon 28mm f/1.4E FX
- Nikon AF 28mm f/1.4D
- Canon 28mm f/1.8 USM
- Sony FE 28mm F2
- Nikon 28mm f/2.0
- Sony E 35mm F1.8 OSS
Also see: depth of field, bokeh, crop factor, lens compression.