Interactive 3D portrait ray-traced through the published DE1045120B optical prescription (7 elements in 5 groups) with a 41.7 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 | DE1045120B · 7 elements in 5 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 41.7 mm (at f/1.2) | Controls distant background blur disc size |
| Upper-Body Working Distance | 2.01 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 50.9 mm (+1.9%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 17 cm (1.93 m – 2.10 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 1 m | Closest focusing distance from the sensor |
Wide open at f/1.2, the Leica NOCTILUX 50mm f/1.2 ASPH has a 41.7 mm entrance pupil (50 mm ÷ 1.2). In an upper-body portrait at 2.01 m, the sharp depth-of-field zone spans 17 cm (1.93 m to 2.10 m), while mechanical vignetting and 7 glass elements shape the out-of-focus highlights.
Based on patent DE1045120B, tracing the focusing group at 2.01 m gives an effective framing focal length of 50.9 mm (+1.9% vs. the nominal 50 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (DE1045120B) 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.
