Fujifilm XF 23mm F1.4 R LM WR vs Fujifilm XF 33mm F1.4 R LM WR — Comparaison ray-tracing optique et bokeh

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

Optical & Portrait Metric	Fujifilm XF 23mm F1.4 R LM WR	Fujifilm XF 33mm F1.4 R LM WR	What It Means in Practice
Upper-Body Working Distance	1.42 m	2.03 m	The Fujifilm XF 33mm F1.4 R LM WR requires 0.6 m more room behind you for the same subject size.
Effective Focal Length (Breathing)	23.0 mm (-0.0%)	30.6 mm (-7.4%)	Fujifilm XF 23mm F1.4 R LM WR frames like 23.0 mm (-0.0%) at 1.4 m; Fujifilm XF 33mm F1.4 R LM WR frames like 30.6 mm (-7.4%) at 2.0 m.
Depth of Field (Sharp Zone)	32 cm (1.28 m – 1.60 m)	31 cm (1.89 m – 2.19 m)	The Fujifilm XF 33mm F1.4 R LM WR has a 2% thinner focus zone (32 cm vs. 31 cm)—requiring more precise eye focus.
Entrance Pupil Diameter	16.4 mm (f/1.4)	23.6 mm (f/1.4)	Distant background blur discs are 44% larger on the Fujifilm XF 33mm F1.4 R LM WR.
Minimum Focus Distance	0.28 m	0.3 m	Fujifilm XF 23mm F1.4 R LM WR focuses 2 cm closer (0.28 m vs. 0.3 m) for tighter close-ups.
Patent Prescription	US20140368926A1 (11/8)	US20220276464A1 (15/10)	Published optical prescriptions traced in the 3D simulator above.

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Questions

Which blurs the background more, Fujifilm XF 23mm F1.4 R LM WR or Fujifilm XF 33mm 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 23mm F1.4 R LM WR at f/1.4 has a 16.4 mm entrance pupil, while Fujifilm XF 33mm F1.4 R LM WR at f/1.4 has a 23.6 mm entrance pupil.

How does working distance differ between Fujifilm XF 23mm F1.4 R LM WR and Fujifilm XF 33mm F1.4 R LM WR?

For an upper-body portrait, Fujifilm XF 23mm F1.4 R LM WR stands 1.42 m from the subject (sharp zone 32 cm, from 1.28 m to 1.60 m), whereas Fujifilm XF 33mm F1.4 R LM WR stands 2.03 m away (sharp zone 31 cm, from 1.89 m to 2.19 m).

How do the optical designs of Fujifilm XF 23mm F1.4 R LM WR and Fujifilm XF 33mm F1.4 R LM WR compare?

Fujifilm XF 23mm F1.4 R LM WR uses 11 elements in 8 groups (US20140368926A1, effective focal length 23.0 mm at portrait distance). Fujifilm XF 33mm F1.4 R LM WR uses 15 elements in 10 groups (US20220276464A1, effective focal length 30.6 mm).

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