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Leica APO-Summicron-SL 35mm f/2 ASPH. vs. Leica Summicron-SL 35mm f/2 ASPH.

Nearly identical rendering; choose by mount, size or price. Compare both side by side.

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

Optical & Portrait Metric Leica APO-Summicron-SL 35mm f/2 ASPH. Leica Summicron-SL 35mm f/2 ASPH. 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.
Background Field of View (Compression) 54° 55° Identical 54° horizontal background view behind the subject.
Entrance Pupil Diameter 17.5 mm (f/2) 17.5 mm (f/2) Nearly identical distant background blur size at equal framing.
Corner Bokeh Roundness (90% Field) 74% (-0.6 EV) 52% (-1.7 EV) Leica APO-Summicron-SL 35mm f/2 ASPH. keeps significantly rounder bokeh balls into the corners wide open (74% vs. 52% roundness).
Effective Focal Length (Breathing) 35.7 mm (+2.0%) 34.8 mm (-0.5%) At 1.4 m, Leica APO-Summicron-SL 35mm f/2 ASPH. frames like a 35.7 mm lens while Leica Summicron-SL 35mm f/2 ASPH. frames like a 34.8 mm lens.
Depth of Field (Sharp Zone) 29 cm (1.29 m – 1.58 m) 29 cm (1.29 m – 1.58 m) Both lenses deliver the exact same 29 cm sharp focus zone.
Minimum Focus Distance 0.27 m 0.25 m Leica Summicron-SL 35mm f/2 ASPH. focuses 2 cm closer (0.27 m vs. 0.25 m) for tighter close-ups.

Questions

Which blurs the background more, Leica APO-Summicron-SL 35mm f/2 ASPH. or Leica Summicron-SL 35mm f/2 ASPH.?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Leica APO-Summicron-SL 35mm f/2 ASPH. at f/2 has a 17.5 mm entrance pupil, while Leica Summicron-SL 35mm f/2 ASPH. at f/2 has a 17.5 mm entrance pupil.

How does working distance differ between Leica APO-Summicron-SL 35mm f/2 ASPH. and Leica Summicron-SL 35mm f/2 ASPH.?

For an upper-body portrait, Leica APO-Summicron-SL 35mm f/2 ASPH. stands 1.42 m from the subject (sharp zone 29 cm, from 1.29 m to 1.58 m), whereas Leica Summicron-SL 35mm f/2 ASPH. stands 1.42 m away (sharp zone 29 cm, from 1.29 m to 1.58 m).

How do the optical designs of Leica APO-Summicron-SL 35mm f/2 ASPH. and Leica Summicron-SL 35mm f/2 ASPH. compare?

Leica APO-Summicron-SL 35mm f/2 ASPH. uses 10 elements in 5 groups (US20220066176A1, effective focal length 35.7 mm at portrait distance). Leica Summicron-SL 35mm f/2 ASPH. uses 12 elements in 8 groups (EP3029504A1, effective focal length 34.8 mm).

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