Interactive 3D portrait ray-traced through the published FR1233449A optical prescription (7 elements in 5 groups) with a 25.0 mm entrance pupil and 1 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | FR1233449A · 7 elements in 5 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 25.0 mm (at f/1.4) | 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) | 35.5 mm (+1.6%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 20 cm (1.33 m – 1.53 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 1 m | Closest focusing distance from the sensor |
Wide open at f/1.4, the Leica Summilux-M 35mm f/1.4 Pre-ASPH has a 25.0 mm entrance pupil (35 mm ÷ 1.4). In an upper-body portrait at 1.42 m, the sharp depth-of-field zone spans 20 cm (1.33 m to 1.53 m), while mechanical vignetting and 7 glass elements shape the out-of-focus highlights.
Based on patent FR1233449A, tracing the focusing group at 1.42 m gives an effective framing focal length of 35.5 mm (+1.6% vs. the nominal 35 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (FR1233449A) specifies 7 lens elements in 5 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Wszystkie porównania obiektywów
Zobacz też: głębia ostrości, bokeh, współczynnik crop, kompresja.
