Fujifilm XF 50mm F1.0 R WR vs. Fujifilm XF 56mm F1.2 R WR

Ray-traced side by side from their optical patents for the same upper-body portrait framing: compare the Fujifilm XF 50mm F1.0 R WR (3.1 m working distance, 50.0 mm pupil) against the Fujifilm XF 56mm F1.2 R WR (3.4 m working distance, 46.7 mm pupil).

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Comparaison portrait en un coup d’œil (cadrage buste)

Optical & Portrait Metric Fujifilm XF 50mm F1.0 R WR Fujifilm XF 56mm F1.2 R WR What It Means in Practice
Upper-Body Working Distance 3.06 m 3.42 m The Fujifilm XF 56mm F1.2 R WR requires 0.4 m more room behind you for the same subject size.
Effective Focal Length (Breathing) 48.5 mm (-2.9%) 56.2 mm (+0.4%) Fujifilm XF 50mm F1.0 R WR frames like 48.5 mm (-2.9%) at 3.1 m; Fujifilm XF 56mm F1.2 R WR frames like 56.2 mm (+0.4%) at 3.4 m.
Depth of Field (Sharp Zone) 22 cm (2.95 m – 3.17 m) 26 cm (3.30 m – 3.56 m) The Fujifilm XF 50mm F1.0 R WR has a 17% thinner focus zone (22 cm vs. 26 cm)—requiring more precise eye focus.
Entrance Pupil Diameter 50.0 mm (f/1) 46.7 mm (f/1.2) Nearly identical distant background blur size at equal framing.
Minimum Focus Distance 0.7 m 0.5 m Fujifilm XF 56mm F1.2 R WR focuses 20 cm closer (0.7 m vs. 0.5 m) for tighter close-ups.
Patent Prescription US20210231927A1 (12/9) JP2023-029039A (13/8) Published optical prescriptions traced in the 3D simulator above.

Questions

Which blurs the background more, Fujifilm XF 50mm F1.0 R WR or Fujifilm XF 56mm F1.2 R WR?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Fujifilm XF 50mm F1.0 R WR at f/1 has a 50.0 mm entrance pupil, while Fujifilm XF 56mm F1.2 R WR at f/1.2 has a 46.7 mm entrance pupil.

How does working distance differ between Fujifilm XF 50mm F1.0 R WR and Fujifilm XF 56mm F1.2 R WR?

For an upper-body portrait, Fujifilm XF 50mm F1.0 R WR stands 3.06 m from the subject (sharp zone 22 cm, from 2.95 m to 3.17 m), whereas Fujifilm XF 56mm F1.2 R WR stands 3.42 m away (sharp zone 26 cm, from 3.30 m to 3.56 m).

How do the optical designs of Fujifilm XF 50mm F1.0 R WR and Fujifilm XF 56mm F1.2 R WR compare?

Fujifilm XF 50mm F1.0 R WR uses 12 elements in 9 groups (US20210231927A1, effective focal length 48.5 mm at portrait distance). Fujifilm XF 56mm F1.2 R WR uses 13 elements in 8 groups (JP2023-029039A, effective focal length 56.2 mm).

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Voir aussi: profondeur de champ, bokeh, facteur de recadrage, compression.