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Leica Telyt 200mm f/4 — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published DE1096057B optical prescription (4 elements in 4 groups) with a 50.0 mm entrance pupil and 2.5 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | DE1096057B · 4 elements in 4 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 50.0 mm (at f/4) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 99% at f/4 · 0.0 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 10° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 8.00 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 208.5 mm (+4.2%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 56 cm (7.73 m – 8.29 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 2.5 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Leica Telyt 200mm f/4 produce?
Wide open at f/4, the Leica Telyt 200mm f/4 has a 50.0 mm entrance pupil (200 mm ÷ 4) and 99% bokeh roundness in the 90% corner (0.0 EV corner falloff). In an upper-body portrait at 8.00 m, the sharp depth-of-field zone spans 56 cm (7.73 m to 8.29 m) with a 10° horizontal background angle of view.
Does the Leica Telyt 200mm f/4 show focus breathing at portrait distance?
Based on patent DE1096057B, tracing the focusing group at 8.00 m gives an effective framing focal length of 208.5 mm (+4.2% vs. the nominal 200 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Leica Telyt 200mm f/4?
The patent prescription (DE1096057B) specifies 4 lens elements in 4 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- 50mm vs 200mm focal length comparison
- 70mm vs 200mm focal length comparison
- 85mm vs 200mm focal length comparison
- 105mm vs 200mm focal length comparison
- 135mm vs 200mm focal length comparison
- 35mm vs 135mm focal length comparison
Compare with similar portrait lenses
- Nikon 200mm f/4 Micro-NIKKOR
- Canon 180mm f/3.5 L Macro
- Nikon 200mm f/2 VR II FX
- Nikon NIKKOR 180mm f/2.8 AI
- Canon 200mm f/2L IS USM
- Nikon 135mm f/2.8 AI-s
Also see: depth of field, bokeh, crop factor, lens compression.