Portrait At-a-Glance Comparison (Upper Body Framing)
| Optical & Portrait Metric | Nikon 105mm f/1.4 FX | Nikon NIKKOR Z 135mm f/1.8 S Plena | What It Means in Practice |
|---|---|---|---|
| Upper-Body Working Distance | 4.21 m | 5.40 m | The Nikon NIKKOR Z 135mm f/1.8 S Plena requires 1.2 m more room behind you for the same subject size. |
| Background Field of View (Compression) | 18° | 16° | Nikon NIKKOR Z 135mm f/1.8 S Plena shows a 11% narrower slice of the room behind the subject (16° vs. 18°), isolating them against a cleaner background. |
| Entrance Pupil Diameter | 75.0 mm (f/1.4) | 75.0 mm (f/1.8) | Nearly identical distant background blur size at equal framing. |
| Corner Bokeh Roundness (90% Field) | 62% (-1.1 EV) | 100% (0.0 EV) | Nikon NIKKOR Z 135mm f/1.8 S Plena keeps significantly rounder bokeh balls into the corners wide open (100% vs. 62% roundness). |
| Effective Focal Length (Breathing) | 111.5 mm (+6.1%) | 130.2 mm (-3.6%) | Nikon 105mm f/1.4 FX frames like 111.5 mm (+6.1%) at 4.2 m; Nikon NIKKOR Z 135mm f/1.8 S Plena frames like 130.2 mm (-3.6%) at 5.4 m. |
| Depth of Field (Sharp Zone) | 20 cm (4.11 m – 4.31 m) | 25 cm (5.28 m – 5.53 m) | The Nikon 105mm f/1.4 FX has a 22% thinner focus zone (20 cm vs. 25 cm)—requiring more precise eye focus. |
| Minimum Focus Distance | 1 m | 0.82 m | Nikon NIKKOR Z 135mm f/1.8 S Plena focuses 18 cm closer (1 m vs. 0.82 m) for tighter close-ups. |