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Obiettivi corrispondenti di ogni marca, più alcuni classici di medio e grande formato. Scrivimi se qualcosa è sbagliato o manca.
Interactive 3D portrait ray-traced through the published DE1805326U optical prescription (3 elements in 3 groups) with a 35.7 mm entrance pupil and 1.1 m minimum focus.
I link eBay possono fruttarci una commissione, senza costi aggiuntivi per te.
Obiettivi corrispondenti di ogni marca, più alcuni classici di medio e grande formato. Scrivimi se qualcosa è sbagliato o manca.
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | DE1805326U · 3 elements in 3 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 35.7 mm (at f/2.8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 100% at f/2.8 · 0.0 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 20° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 4.01 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 102.7 mm (+2.7%) | 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 | 1.1 m | Closest focusing distance from the sensor |
Wide open at f/2.8, the Meyer-Optik Görlitz Trioplan 100mm f/2.8 has a 35.7 mm entrance pupil (100 mm ÷ 2.8) and 100% bokeh roundness in the 90% corner (0.0 EV corner falloff). 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) with a 20° horizontal background angle of view.
Based on patent DE1805326U, tracing the focusing group at 4.01 m gives an effective framing focal length of 102.7 mm (+2.7% vs. the nominal 100 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (DE1805326U) specifies 3 lens elements in 3 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Vedi anche: profondità di campo, bokeh, fattore di crop, compressione.