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

Ray-traced side by side from their optical patents for the same upper-body portrait framing: compare the Fujifilm GF 45mm F2.8 R WR (1.5 m working distance, 16.1 mm pupil) against the Fujifilm GF 50mm F3.5 R LM WR (1.7 m working distance, 14.3 mm pupil).

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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.
Effective Focal Length (Breathing) 42.3 mm (-5.9%) 47.6 mm (-4.8%) Fujifilm GF 45mm F2.8 R WR frames like 42.3 mm (-5.9%) at 1.5 m; Fujifilm GF 50mm F3.5 R LM WR frames like 47.6 mm (-4.8%) 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.
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.
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.
Patent Prescription US20200174231A1 (11/8) US20200166730A1 (9/6) Published optical prescriptions traced in the 3D simulator above.

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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 42.3 mm at portrait distance). Fujifilm GF 50mm F3.5 R LM WR uses 9 elements in 6 groups (US20200166730A1, effective focal length 47.6 mm).

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