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Sony FE 100mm F2.8 STF GM OSS — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published JPH11231209A optical prescription (8 elements in 6 groups) with a 35.7 mm entrance pupil and 0.57 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JPH11231209A · 8 elements in 6 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 35.7 mm (at f/2.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 4.01 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 104.7 mm (+4.7%) | 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 | 0.57 m | Closest focusing distance from the sensor |
Questions
How much background blur does the Sony FE 100mm F2.8 STF GM OSS produce?
Wide open at f/2.8, the Sony FE 100mm F2.8 STF GM OSS has a 35.7 mm entrance pupil (100 mm ÷ 2.8). 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), while mechanical vignetting and 8 glass elements shape the out-of-focus highlights.
Does the Sony FE 100mm F2.8 STF GM OSS show focus breathing at portrait distance?
Based on patent JPH11231209A, tracing the focusing group at 4.01 m gives an effective framing focal length of 104.7 mm (+4.7% 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 Sony FE 100mm F2.8 STF GM OSS?
The patent prescription (JPH11231209A) specifies 8 lens elements in 6 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Head-to-head patent comparisons with Sony FE 100mm F2.8 STF GM OSS
Related comparisons
- Sony FE 100mm F2.8 Macro GM OSS
- Canon RF 100mm F2.8 L MACRO IS USM
- Canon EF 100mm f/2.8L Macro IS USM
Also see: depth of field, bokeh, crop factor, lens compression.