Find a lens for this look
eBay links may earn us a commission, at no extra cost to you.
Matching lenses from each maker's lineup, plus some classic medium and large format lenses. Email me if something is wrong or missing.
Leica APO-Macro-Elmarit-SL 100mm f/2.8 — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published JP2016-090725A optical prescription (10 elements in 9 groups, 4 aspherical) with a 35.7 mm entrance pupil and 0.3 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2016-090725A · 10 elements in 9 groups (4 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 35.7 mm (at f/2.8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 85% at f/2.8 (≥86% from f/4) · -0.3 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 21° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 4.01 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 97.6 mm (-2.4%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 39 cm (3.82 m – 4.21 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.3 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Leica APO-Macro-Elmarit-SL 100mm f/2.8 produce?
Wide open at f/2.8, the Leica APO-Macro-Elmarit-SL 100mm f/2.8 has a 35.7 mm entrance pupil (100 mm ÷ 2.8) and 85% bokeh roundness in the 90% corner (-0.3 EV corner falloff, reaching ≥86% roundness from f/4). In an upper-body portrait at 4.01 m, the sharp depth-of-field zone spans 39 cm (3.82 m to 4.21 m) with a 21° horizontal background angle of view.
Does the Leica APO-Macro-Elmarit-SL 100mm f/2.8 show focus breathing at portrait distance?
Based on patent JP2016-090725A, tracing the focusing group at 4.01 m gives an effective framing focal length of 97.6 mm (-2.4% vs. the nominal 100 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Leica APO-Macro-Elmarit-SL 100mm f/2.8?
The patent prescription (JP2016-090725A) specifies 10 lens elements in 9 groups with 4 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- 50mm vs 105mm focal length comparison
- 58mm vs 105mm focal length comparison
- 85mm vs 105mm focal length comparison
- 105mm vs 135mm focal length comparison
- 105mm vs 200mm focal length comparison
- 135mm medium format vs 105mm full frame focal length comparison
Compare with similar portrait lenses
- Sony FE 100mm F2.8 Macro GM OSS
- Sony FE 100mm F2.8 STF GM OSS
- Nikon 100mm f/2.8 Series E
- Canon RF 100mm F2.8 L MACRO IS USM
- Canon EF 100mm f/2.8L Macro IS USM
- Leica ELMAR 135mm f/4
Also see: depth of field, bokeh, crop factor, lens compression.