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 Summilux-M 90mm f/1.5 ASPH. — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US8508864B2 optical prescription (14 elements in 11 groups, 2 aspherical) with a 60.0 mm entrance pupil and 1 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US8508864B2 · 14 elements in 11 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 60.0 mm (at f/1.5) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 53% at f/1.5 (≥86% from f/5.6) · -1.1 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 | 3.61 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 91.5 mm (+1.7%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 21 cm (3.50 m – 3.72 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 1 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Leica Summilux-M 90mm f/1.5 ASPH. produce?
Wide open at f/1.5, the Leica Summilux-M 90mm f/1.5 ASPH. has a 60.0 mm entrance pupil (90 mm ÷ 1.5) and 53% bokeh roundness in the 90% corner (-1.1 EV corner falloff, reaching ≥86% roundness from f/5.6). In an upper-body portrait at 3.61 m, the sharp depth-of-field zone spans 21 cm (3.50 m to 3.72 m) with a 22° horizontal background angle of view.
Does the Leica Summilux-M 90mm f/1.5 ASPH. show focus breathing at portrait distance?
Based on patent US8508864B2, tracing the focusing group at 3.61 m gives an effective framing focal length of 91.5 mm (+1.7% vs. the nominal 90 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Leica Summilux-M 90mm f/1.5 ASPH.?
The patent prescription (US8508864B2) specifies 14 lens elements in 11 groups with 2 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Leica Summilux-M 90mm f/1.5 ASPH. vs. Leica APO-Summicron-M 90mm f/2 ASPH.
- Leica APO-Summicron-M 90mm f/2 ASPH.
- Leica TELE-ELMARIT-M 90mm f/2.8
- Leica Macro-Elmar-M 90mm f/4
Compare with similar portrait lenses
- Sony FE 85mm F1.4 GM II
- Sony FE 85mm F1.4 GM
- Nikon 85mm f/1.4 G FX
- Nikon 85mm f/1.4 AI-s
- Nikon AF 85mm f/1.4D IF
- Nikon NIKKOR Z 58mm f/0.95 S Noct
Also see: depth of field, bokeh, crop factor, lens compression.