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Canon 50mm f/0.95 — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US2836102A optical prescription (7 elements in 5 groups) with a 52.6 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 | US2836102A · 7 elements in 5 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 52.6 mm (at f/0.95) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 50% at f/0.95 (≥86% from f/2.8) · -1.4 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 38° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 2.01 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 51.8 mm (+3.5%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 14 cm (1.95 m – 2.08 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 Canon 50mm f/0.95 produce?
Wide open at f/0.95, the Canon 50mm f/0.95 has a 52.6 mm entrance pupil (50 mm ÷ 0.95) and 50% bokeh roundness in the 90% corner (-1.4 EV corner falloff, reaching ≥86% roundness from f/2.8). In an upper-body portrait at 2.01 m, the sharp depth-of-field zone spans 14 cm (1.95 m to 2.08 m) with a 38° horizontal background angle of view.
Does the Canon 50mm f/0.95 show focus breathing at portrait distance?
Based on patent US2836102A, tracing the focusing group at 2.01 m gives an effective framing focal length of 51.8 mm (+3.5% vs. the nominal 50 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Canon 50mm f/0.95?
The patent prescription (US2836102A) specifies 7 lens elements in 5 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Canon 50mm f/0.95 vs. Canon 50mm f/1.0 L
- Canon 50mm f/0.95 vs. Canon RF 50mm F1.2 L USM
- Canon 50mm f/1.0 L
- Canon 40mm f/2.8 STM
Compare with similar portrait lenses
- Leica Noctilux-M 50mm f/0.95 ASPH.
- Sony FE 50mm F1.2 GM
- Canon RF 50mm F1.2 L USM
- Nikon NIKKOR Z 50mm f/1.2 S
- Canon 85mm f/1.8
Also see: depth of field, bokeh, crop factor, lens compression.