Fujifilm XF 35mm F1.4 R vs. Fujifilm XF 35mm F2 R WR

Ray-traced side by side from their optical patents at a 2.1 m upper-body portrait distance: compare how the Fujifilm XF 35mm F1.4 R (25.0 mm entrance pupil) and Fujifilm XF 35mm F2 R WR (17.5 mm entrance pupil) differ in background blur size, edge bokeh, and depth of field.

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

Optical & Portrait Metric Fujifilm XF 35mm F1.4 R Fujifilm XF 35mm F2 R WR What It Means in Practice
Upper-Body Working Distance 2.15 m 2.15 m Identical working distance—both frame an upper-body portrait from the exact same spot.
Effective Focal Length (Breathing) 35.0 mm (+0.1%) 34.7 mm (-0.8%) At 2.1 m, Fujifilm XF 35mm F1.4 R frames like a 35.0 mm lens while Fujifilm XF 35mm F2 R WR frames like a 34.7 mm lens.
Depth of Field (Sharp Zone) 31 cm (2.01 m – 2.31 m) 44 cm (1.95 m – 2.39 m) The Fujifilm XF 35mm F1.4 R has a 30% thinner focus zone (31 cm vs. 44 cm)—requiring more precise eye focus.
Entrance Pupil Diameter 25.0 mm (f/1.4) 17.5 mm (f/2) Distant background blur discs are 43% larger on the Fujifilm XF 35mm F1.4 R.
Minimum Focus Distance 0.28 m 0.35 m Fujifilm XF 35mm F1.4 R focuses 7 cm closer (0.28 m vs. 0.35 m) for tighter close-ups.
Patent Prescription US20140285903A1 (8/6) US20170010441A1 (9/6) Published optical prescriptions traced in the 3D simulator above.

Questions

Which blurs the background more, Fujifilm XF 35mm F1.4 R or Fujifilm XF 35mm F2 R WR?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Fujifilm XF 35mm F1.4 R at f/1.4 has a 25.0 mm entrance pupil, while Fujifilm XF 35mm F2 R WR at f/2 has a 17.5 mm entrance pupil.

How does working distance differ between Fujifilm XF 35mm F1.4 R and Fujifilm XF 35mm F2 R WR?

For an upper-body portrait, Fujifilm XF 35mm F1.4 R stands 2.15 m from the subject (sharp zone 31 cm, from 2.01 m to 2.31 m), whereas Fujifilm XF 35mm F2 R WR stands 2.15 m away (sharp zone 44 cm, from 1.95 m to 2.39 m).

How do the optical designs of Fujifilm XF 35mm F1.4 R and Fujifilm XF 35mm F2 R WR compare?

Fujifilm XF 35mm F1.4 R uses 8 elements in 6 groups (US20140285903A1, effective focal length 35.0 mm at portrait distance). Fujifilm XF 35mm F2 R WR uses 9 elements in 6 groups (US20170010441A1, effective focal length 34.7 mm).

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