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Fujifilm XF 18mm F1.4 R LM WR vs. Fujifilm XF 23mm F1.4 R LM WR

Ray-traced side by side from their optical patents for the same upper-body portrait framing: compare the Fujifilm XF 18mm F1.4 R LM WR (1.1 m working distance, 12.9 mm pupil) against the Fujifilm XF 23mm F1.4 R LM WR (1.4 m working distance, 16.4 mm pupil).

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Comparación de retrato de un vistazo (medio cuerpo)

Optical & Portrait Metric Fujifilm XF 18mm F1.4 R LM WR Fujifilm XF 23mm F1.4 R LM WR What It Means in Practice
Upper-Body Working Distance 1.13 m 1.42 m The Fujifilm XF 23mm F1.4 R LM WR requires 0.3 m more room behind you for the same subject size.
Effective Focal Length (Breathing) 16.7 mm (-7.4%) 23.0 mm (-0.0%) Fujifilm XF 18mm F1.4 R LM WR frames like 16.7 mm (-7.4%) at 1.1 m; Fujifilm XF 23mm F1.4 R LM WR frames like 23.0 mm (-0.0%) at 1.4 m.
Depth of Field (Sharp Zone) 32 cm (99 cm – 1.31 m) 32 cm (1.28 m – 1.60 m) Both lenses deliver the exact same 32 cm sharp focus zone.
Entrance Pupil Diameter 12.9 mm (f/1.4) 16.4 mm (f/1.4) Distant background blur discs are 27% larger on the Fujifilm XF 23mm F1.4 R LM WR.
Minimum Focus Distance 0.2 m 0.28 m Fujifilm XF 18mm F1.4 R LM WR focuses 8 cm closer (0.2 m vs. 0.28 m) for tighter close-ups.
Patent Prescription US20220011542A1 (15/9) US20140368926A1 (11/8) Published optical prescriptions traced in the 3D simulator above.

Preguntas

Which blurs the background more, Fujifilm XF 18mm F1.4 R LM WR or Fujifilm XF 23mm F1.4 R LM WR?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Fujifilm XF 18mm F1.4 R LM WR at f/1.4 has a 12.9 mm entrance pupil, while Fujifilm XF 23mm F1.4 R LM WR at f/1.4 has a 16.4 mm entrance pupil.

How does working distance differ between Fujifilm XF 18mm F1.4 R LM WR and Fujifilm XF 23mm F1.4 R LM WR?

For an upper-body portrait, Fujifilm XF 18mm F1.4 R LM WR stands 1.13 m from the subject (sharp zone 32 cm, from 99 cm to 1.31 m), whereas Fujifilm XF 23mm F1.4 R LM WR stands 1.42 m away (sharp zone 32 cm, from 1.28 m to 1.60 m).

How do the optical designs of Fujifilm XF 18mm F1.4 R LM WR and Fujifilm XF 23mm F1.4 R LM WR compare?

Fujifilm XF 18mm F1.4 R LM WR uses 15 elements in 9 groups (US20220011542A1, effective focal length 16.7 mm at portrait distance). Fujifilm XF 23mm F1.4 R LM WR uses 11 elements in 8 groups (US20140368926A1, effective focal length 23.0 mm).

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Ver también: profundidad de campo, bokeh, factor de recorte, compresión.