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Sony FE 85mm F1.4 GM II — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published WO2025239028A1 optical prescription (14 elements in 11 groups, 3 aspherical) with a 60.7 mm entrance pupil and 0.85 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | WO2025239028A1 · 14 elements in 11 groups (3 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 60.7 mm (at f/1.4) | Controls distant background blur disc size |
| Upper-Body Working Distance | 3.41 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 83.0 mm (-2.4%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 20 cm (3.31 m – 3.51 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.85 m | Closest focusing distance from the sensor |
Questions
How much background blur does the Sony FE 85mm F1.4 GM II produce?
Wide open at f/1.4, the Sony FE 85mm F1.4 GM II has a 60.7 mm entrance pupil (85 mm ÷ 1.4). In an upper-body portrait at 3.41 m, the sharp depth-of-field zone spans 20 cm (3.31 m to 3.51 m), while mechanical vignetting and 14 glass elements shape the out-of-focus highlights.
Does the Sony FE 85mm F1.4 GM II show focus breathing at portrait distance?
Based on patent WO2025239028A1, tracing the focusing group at 3.41 m gives an effective framing focal length of 83.0 mm (-2.4% vs. the nominal 85 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Sony FE 85mm F1.4 GM II?
The patent prescription (WO2025239028A1) specifies 14 lens elements in 11 groups with 3 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Head-to-head patent comparisons with Sony FE 85mm F1.4 GM II
- Sony FE 85mm F1.4 GM II vs. Sony FE 85mm F1.4 GM
- Sony FE 85mm F1.4 GM II vs. Sony FE 85mm f/1.8
- Sony FE 85mm F1.4 GM II vs. Sony FE 50mm F1.2 GM
- Sony FE 85mm F1.4 GM II vs. Sony FE 135mm F1.8 GM
- Sony FE 85mm F1.4 GM II vs. Nikon NIKKOR Z 85mm f/1.2 S
- Sony FE 85mm F1.4 GM II vs. Canon RF 85mm F1.2 L USM
Related comparisons
Also see: depth of field, bokeh, crop factor, lens compression.