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Canon EF 50mm f/1.8 II vs. Canon RF 50mm F1.8 STM

Ray-traced side by side from their optical patents at a 2.0 m upper-body portrait distance: compare how the Canon EF 50mm f/1.8 II (27.8 mm entrance pupil) and Canon RF 50mm F1.8 STM (27.8 mm entrance pupil) differ in background blur size, edge bokeh, and depth of field.

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Comparaison portrait en un coup d’œil (cadrage buste)

Optical & Portrait Metric Canon EF 50mm f/1.8 II Canon RF 50mm F1.8 STM What It Means in Practice
Upper-Body Working Distance 2.01 m 2.01 m Identical working distance—both frame an upper-body portrait from the exact same spot.
Effective Focal Length (Breathing) 50.7 mm (+1.4%) 51.4 mm (+2.8%) At 2.0 m, Canon EF 50mm f/1.8 II frames like a 50.7 mm lens while Canon RF 50mm F1.8 STM frames like a 51.4 mm lens.
Depth of Field (Sharp Zone) 26 cm (1.89 m – 2.15 m) 26 cm (1.89 m – 2.15 m) Both lenses deliver the exact same 26 cm sharp focus zone.
Entrance Pupil Diameter 27.8 mm (f/1.8) 27.8 mm (f/1.8) Nearly identical distant background blur size at equal framing.
Minimum Focus Distance 0.45 m 0.3 m Canon RF 50mm F1.8 STM focuses 15 cm closer (0.45 m vs. 0.3 m) for tighter close-ups.
Patent Prescription JP S62-087922A (6/5) US20210263286A1 (6/5) Published optical prescriptions traced in the 3D simulator above.

Questions

Which blurs the background more, Canon EF 50mm f/1.8 II or Canon RF 50mm F1.8 STM?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Canon EF 50mm f/1.8 II at f/1.8 has a 27.8 mm entrance pupil, while Canon RF 50mm F1.8 STM at f/1.8 has a 27.8 mm entrance pupil.

How does working distance differ between Canon EF 50mm f/1.8 II and Canon RF 50mm F1.8 STM?

For an upper-body portrait, Canon EF 50mm f/1.8 II stands 2.01 m from the subject (sharp zone 26 cm, from 1.89 m to 2.15 m), whereas Canon RF 50mm F1.8 STM stands 2.01 m away (sharp zone 26 cm, from 1.89 m to 2.15 m).

How do the optical designs of Canon EF 50mm f/1.8 II and Canon RF 50mm F1.8 STM compare?

Canon EF 50mm f/1.8 II uses 6 elements in 5 groups (JP S62-087922A, effective focal length 50.7 mm at portrait distance). Canon RF 50mm F1.8 STM uses 6 elements in 5 groups (US20210263286A1, effective focal length 51.4 mm).

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Voir aussi: profondeur de champ, bokeh, facteur de recadrage, compression.