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Leica DG Macro-Elmarit 45mm f/2.8 ASPH. — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published JP2011-048232A optical prescription (14 elements in 10 groups, 1 aspherical) with a 16.1 mm entrance pupil and 0.15 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2011-048232A · 14 elements in 10 groups (1 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 16.1 mm (at f/2.8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 80% at f/2.8 (≥86% from f/4) · -0.4 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 22° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 3.75 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 45.4 mm (+0.9%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 84 cm (3.38 m – 4.22 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.15 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Leica DG Macro-Elmarit 45mm f/2.8 ASPH. produce?
Wide open at f/2.8, the Leica DG Macro-Elmarit 45mm f/2.8 ASPH. has a 16.1 mm entrance pupil (45 mm ÷ 2.8) and 80% bokeh roundness in the 90% corner (-0.4 EV corner falloff, reaching ≥86% roundness from f/4). In an upper-body portrait at 3.75 m, the sharp depth-of-field zone spans 84 cm (3.38 m to 4.22 m) with a 22° horizontal background angle of view.
Does the Leica DG Macro-Elmarit 45mm f/2.8 ASPH. show focus breathing at portrait distance?
Based on patent JP2011-048232A, tracing the focusing group at 3.75 m gives an effective framing focal length of 45.4 mm (+0.9% vs. the nominal 45 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Leica DG Macro-Elmarit 45mm f/2.8 ASPH.?
The patent prescription (JP2011-048232A) specifies 14 lens elements in 10 groups with 1 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Leica NOCTILUX 50mm f/1.2 ASPH
- Leica Summicron-C 40mm f/2
- Leica SUMMARON 35mm f/2.8
- 45mm medium format vs 35mm full frame focal length comparison
- 24mm vs 50mm focal length comparison
- 28mm vs 50mm focal length comparison
Compare with similar portrait lenses
- Nikon 45mm f/2.8 PC-E
- Nikon 45mm f/2.8P AI-P
- Fujifilm GF 45mm F2.8 R WR
- Sony FE 50mm F2.8 Macro
- Sony AF 50mm F2.8 Macro
- Sony AF 35mm F2
Also see: depth of field, bokeh, crop factor, lens compression.