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Sony MD 50mm F2 — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US4444473A optical prescription (6 elements in 5 groups) with a 25.0 mm entrance pupil and 0.45 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US4444473A · 6 elements in 5 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 25.0 mm (at f/2) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 82% at f/2 (≥86% from f/2.8) · -0.4 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 39° 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) | 51.0 mm (+2.0%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 29 cm (1.88 m – 2.17 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.45 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Sony MD 50mm F2 produce?
Wide open at f/2, the Sony MD 50mm F2 has a 25.0 mm entrance pupil (50 mm ÷ 2) and 82% bokeh roundness in the 90% corner (-0.4 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 29 cm (1.88 m to 2.17 m) with a 39° horizontal background angle of view.
Does the Sony MD 50mm F2 show focus breathing at portrait distance?
Based on patent US4444473A, tracing the focusing group at 2.01 m gives an effective framing focal length of 51.0 mm (+2.0% 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 Sony MD 50mm F2?
The patent prescription (US4444473A) specifies 6 lens elements in 5 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Sony AF 50mm F2.8 Macro
- Sony Hexanon AR 40mm F1.8
- 24mm vs 50mm focal length comparison
- 28mm vs 50mm focal length comparison
- 35mm vs 50mm focal length comparison
- 40mm vs 50mm focal length comparison
Compare with similar portrait lenses
- Sony FE 50mm F1.8
- Nikon 50mm f/2
- Nikon NIKKOR Z 50mm f/1.8 S
- Nikon 50mm f/1.8 AI-s
- Leica APO-Summicron-SL 50mm f/2 ASPH.
- Sony Distagon FE 35mm F1.4 ZA
Also see: depth of field, bokeh, crop factor, lens compression.