Fujifilm GF 80mm F1.7 R WR vs Fujifilm GF 110mm F2 R LM WR — Optical Ray-Tracing & Bokeh Comparison

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

Optical & Portrait Metric	Fujifilm GF 80mm F1.7 R WR	Fujifilm GF 110mm F2 R LM WR	What It Means in Practice
Upper-Body Working Distance	2.64 m	3.62 m	The Fujifilm GF 110mm F2 R LM WR requires 1.0 m more room behind you for the same subject size.
Effective Focal Length (Breathing)	82.5 mm (+3.1%)	114.0 mm (+3.7%)	Fujifilm GF 80mm F1.7 R WR frames like 82.5 mm (+3.1%) at 2.6 m; Fujifilm GF 110mm F2 R LM WR frames like 114.0 mm (+3.7%) at 3.6 m.
Depth of Field (Sharp Zone)	20 cm (2.55 m – 2.74 m)	23 cm (3.51 m – 3.74 m)	The Fujifilm GF 80mm F1.7 R WR has a 15% thinner focus zone (20 cm vs. 23 cm)—requiring more precise eye focus.
Entrance Pupil Diameter	47.1 mm (f/1.7)	55.0 mm (f/2)	Distant background blur discs are 17% larger on the Fujifilm GF 110mm F2 R LM WR.
Minimum Focus Distance	0.7 m	0.9 m	Fujifilm GF 80mm F1.7 R WR focuses 20 cm closer (0.7 m vs. 0.9 m) for tighter close-ups.
Patent Prescription	US20210294073A1 (12/9)	US20180100988A1 (14/9)	Published optical prescriptions traced in the 3D simulator above.

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Questions

Which blurs the background more, Fujifilm GF 80mm F1.7 R WR or Fujifilm GF 110mm F2 R LM WR?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Fujifilm GF 80mm F1.7 R WR at f/1.7 has a 47.1 mm entrance pupil, while Fujifilm GF 110mm F2 R LM WR at f/2 has a 55.0 mm entrance pupil.

How does working distance differ between Fujifilm GF 80mm F1.7 R WR and Fujifilm GF 110mm F2 R LM WR?

For an upper-body portrait, Fujifilm GF 80mm F1.7 R WR stands 2.64 m from the subject (sharp zone 20 cm, from 2.55 m to 2.74 m), whereas Fujifilm GF 110mm F2 R LM WR stands 3.62 m away (sharp zone 23 cm, from 3.51 m to 3.74 m).

How do the optical designs of Fujifilm GF 80mm F1.7 R WR and Fujifilm GF 110mm F2 R LM WR compare?

Fujifilm GF 80mm F1.7 R WR uses 12 elements in 9 groups (US20210294073A1, effective focal length 82.5 mm at portrait distance). Fujifilm GF 110mm F2 R LM WR uses 14 elements in 9 groups (US20180100988A1, effective focal length 114.0 mm).

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