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Leica APO-Summicron-SL 35mm f/2 ASPH. — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20220066176A1 optical prescription (10 elements in 5 groups, 4 aspherical) with a 17.5 mm entrance pupil and 0.27 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20220066176A1 · 10 elements in 5 groups (4 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 17.5 mm (at f/2) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.42 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 35.7 mm (+2.0%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 29 cm (1.29 m – 1.58 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.27 m | Closest focusing distance from the sensor |
Questions
How much background blur does the Leica APO-Summicron-SL 35mm f/2 ASPH. produce?
Wide open at f/2, the Leica APO-Summicron-SL 35mm f/2 ASPH. has a 17.5 mm entrance pupil (35 mm ÷ 2). In an upper-body portrait at 1.42 m, the sharp depth-of-field zone spans 29 cm (1.29 m to 1.58 m), while mechanical vignetting and 10 glass elements shape the out-of-focus highlights.
Does the Leica APO-Summicron-SL 35mm f/2 ASPH. show focus breathing at portrait distance?
Based on patent US20220066176A1, tracing the focusing group at 1.42 m gives an effective framing focal length of 35.7 mm (+2.0% 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 Leica APO-Summicron-SL 35mm f/2 ASPH.?
The patent prescription (US20220066176A1) specifies 10 lens elements in 5 groups with 4 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Head-to-head patent comparisons with Leica APO-Summicron-SL 35mm f/2 ASPH.
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Also see: depth of field, bokeh, crop factor, lens compression.