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Minolta 135mm f/2.8 [T4.5] STF — Simulatore di bokeh e ray-tracing ottico
Interactive 3D portrait ray-traced through the published JPH11231209A optical prescription (8 elements in 6 groups) with a 48.2 mm entrance pupil and 0.87 m minimum focus.
Specifiche ottiche e ritratto (inquadratura mezzo busto)
| 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 | 48.2 mm (at f/2.8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 93% at f/2.8 · -0.1 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 15° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 5.40 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 141.4 mm (+4.7%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 39 cm (5.21 m – 5.61 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.87 m | Closest focusing distance from the sensor |
Domande
How much background blur and corner cat's-eye does the Minolta 135mm f/2.8 [T4.5] STF produce?
Wide open at f/2.8, the Minolta 135mm f/2.8 [T4.5] STF has a 48.2 mm entrance pupil (135 mm ÷ 2.8) and 93% bokeh roundness in the 90% corner (-0.1 EV corner falloff). In an upper-body portrait at 5.40 m, the sharp depth-of-field zone spans 39 cm (5.21 m to 5.61 m) with a 15° horizontal background angle of view.
Does the Minolta 135mm f/2.8 [T4.5] STF show focus breathing at portrait distance?
Based on patent JPH11231209A, tracing the focusing group at 5.40 m gives an effective framing focal length of 141.4 mm (+4.7% vs. the nominal 135 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Minolta 135mm f/2.8 [T4.5] STF?
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.
Confronti diretti da brevetto con Minolta 135mm f/2.8 [T4.5] STF
Confronti collegati
Vedi anche: profondità di campo, bokeh, fattore di crop, compressione.