Sony Distagon FE 35mm F1.4 ZA vs. Sony FE 35mm F1.8

Ray-traced side by side from their optical patents at a 1.4 m upper-body portrait distance: compare how the Sony Distagon FE 35mm F1.4 ZA (25.0 mm entrance pupil) and Sony FE 35mm F1.8 (19.4 mm entrance pupil) differ in background blur size, edge bokeh, and depth of field.

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Optical & Portrait Metric Sony Distagon FE 35mm F1.4 ZA Sony FE 35mm F1.8 What It Means in Practice
Upper-Body Working Distance 1.42 m 1.42 m Identical working distance—both frame an upper-body portrait from the exact same spot.
Effective Focal Length (Breathing) 34.9 mm (-0.4%) 34.4 mm (-1.7%) At 1.4 m, Sony Distagon FE 35mm F1.4 ZA frames like a 34.9 mm lens while Sony FE 35mm F1.8 frames like a 34.4 mm lens.
Depth of Field (Sharp Zone) 20 cm (1.33 m – 1.53 m) 26 cm (1.30 m – 1.56 m) The Sony Distagon FE 35mm F1.4 ZA has a 22% thinner focus zone (20 cm vs. 26 cm)—requiring more precise eye focus.
Entrance Pupil Diameter 25.0 mm (f/1.4) 19.4 mm (f/1.8) Distant background blur discs are 29% larger on the Sony Distagon FE 35mm F1.4 ZA.
Minimum Focus Distance 0.3 m 0.22 m Sony FE 35mm F1.8 focuses 8 cm closer (0.3 m vs. 0.22 m) for tighter close-ups.
Patent Prescription US4806003A (10/8) US20140071333A1 (10/8) Published optical prescriptions traced in the 3D simulator above.

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Which blurs the background more, Sony Distagon FE 35mm F1.4 ZA or Sony FE 35mm F1.8?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Sony Distagon FE 35mm F1.4 ZA at f/1.4 has a 25.0 mm entrance pupil, while Sony FE 35mm F1.8 at f/1.8 has a 19.4 mm entrance pupil.

How does working distance differ between Sony Distagon FE 35mm F1.4 ZA and Sony FE 35mm F1.8?

For an upper-body portrait, Sony Distagon FE 35mm F1.4 ZA stands 1.42 m from the subject (sharp zone 20 cm, from 1.33 m to 1.53 m), whereas Sony FE 35mm F1.8 stands 1.42 m away (sharp zone 26 cm, from 1.30 m to 1.56 m).

How do the optical designs of Sony Distagon FE 35mm F1.4 ZA and Sony FE 35mm F1.8 compare?

Sony Distagon FE 35mm F1.4 ZA uses 10 elements in 8 groups (US4806003A, effective focal length 34.9 mm at portrait distance). Sony FE 35mm F1.8 uses 10 elements in 8 groups (US20140071333A1, effective focal length 34.4 mm).

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Zie ook: scherptediepte, bokeh, cropfactor, compressie.