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Fujifilm GF 45mm F2.8 R WR vs. Fujifilm GF 50mm F3.5 R LM WR

Pick the 45mm f/2.8 if you want about 13% more background blur, pick the 50mm f/3.5 if you want less background blur. Compare both side by side.

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Portrait At-a-Glance Comparison (Upper Body Framing)

Optical & Portrait Metric Fujifilm GF 45mm F2.8 R WR Fujifilm GF 50mm F3.5 R LM WR What It Means in Practice
Upper-Body Working Distance 1.50 m 1.66 m The Fujifilm GF 50mm F3.5 R LM WR requires 0.2 m more room behind you for the same subject size.
Background Field of View (Compression) 52° 48° Fujifilm GF 50mm F3.5 R LM WR shows a 8% narrower slice of the room behind the subject (48° vs. 52°), isolating them against a cleaner background.
Entrance Pupil Diameter 16.1 mm (f/2.8) 14.3 mm (f/3.5) Distant background blur discs are 13% larger on the Fujifilm GF 45mm F2.8 R WR.
Corner Bokeh Roundness (90% Field) 85% (-0.5 EV) 82% (-0.5 EV) Similar corner bokeh shape wide open (85% vs. 82% roundness at 90% field).
Effective Focal Length (Breathing) 45.0 mm (-0.0%) 49.2 mm (-1.5%) Fujifilm GF 45mm F2.8 R WR frames like 45.0 mm (-0.0%) at 1.5 m; Fujifilm GF 50mm F3.5 R LM WR frames like 49.2 mm (-1.5%) at 1.7 m.
Depth of Field (Sharp Zone) 33 cm (1.35 m – 1.68 m) 42 cm (1.48 m – 1.90 m) The Fujifilm GF 45mm F2.8 R WR has a 20% thinner focus zone (33 cm vs. 42 cm)—requiring more precise eye focus.
Minimum Focus Distance 0.45 m 0.55 m Fujifilm GF 45mm F2.8 R WR focuses 10 cm closer (0.45 m vs. 0.55 m) for tighter close-ups.

Questions

Which blurs the background more, Fujifilm GF 45mm F2.8 R WR or Fujifilm GF 50mm F3.5 R LM WR?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Fujifilm GF 45mm F2.8 R WR at f/2.8 has a 16.1 mm entrance pupil, while Fujifilm GF 50mm F3.5 R LM WR at f/3.5 has a 14.3 mm entrance pupil.

How does working distance differ between Fujifilm GF 45mm F2.8 R WR and Fujifilm GF 50mm F3.5 R LM WR?

For an upper-body portrait, Fujifilm GF 45mm F2.8 R WR stands 1.50 m from the subject (sharp zone 33 cm, from 1.35 m to 1.68 m), whereas Fujifilm GF 50mm F3.5 R LM WR stands 1.66 m away (sharp zone 42 cm, from 1.48 m to 1.90 m).

How do the optical designs of Fujifilm GF 45mm F2.8 R WR and Fujifilm GF 50mm F3.5 R LM WR compare?

Fujifilm GF 45mm F2.8 R WR uses 11 elements in 8 groups (US20200174231A1, effective focal length 45.0 mm at portrait distance). Fujifilm GF 50mm F3.5 R LM WR uses 9 elements in 6 groups (US20200166730A1, effective focal length 49.2 mm).

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Also see: depth of field, bokeh, crop factor, lens compression.