Fujifilm XF 35mm F1.4 R vs. Fujifilm XF 35mm F2 R WR
Pick the 35mm f/1.4 if you want about 43% more background blur, pick the 35mm f/2 if you want rounder highlights when stopped down. Compare both side by side.
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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 35.4 mm at portrait distance). Fujifilm XF 35mm F2 R WR uses 9 elements in 6 groups (US20170010441A1, effective focal length 34.5 mm).
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Also see: depth of field, bokeh, crop factor, lens compression.