Canon RF 85mm F1.2 L USM vs Canon RF 135mm F1.8 L IS USM — Porównanie optycznego ray-tracingu i bokeh

Porównanie portretowe w skrócie (popiersie)

Optical & Portrait Metric	Canon RF 85mm F1.2 L USM	Canon RF 135mm F1.8 L IS USM	What It Means in Practice
Upper-Body Working Distance	3.41 m	5.40 m	The Canon RF 135mm F1.8 L IS USM requires 2.0 m more room behind you for the same subject size.
Effective Focal Length (Breathing)	88.4 mm (+4.0%)	132.7 mm (-1.7%)	Canon RF 85mm F1.2 L USM frames like 88.4 mm (+4.0%) at 3.4 m; Canon RF 135mm F1.8 L IS USM frames like 132.7 mm (-1.7%) at 5.4 m.
Depth of Field (Sharp Zone)	17 cm (3.33 m – 3.49 m)	25 cm (5.28 m – 5.53 m)	The Canon RF 85mm F1.2 L USM has a 33% thinner focus zone (17 cm vs. 25 cm)—requiring more precise eye focus.
Entrance Pupil Diameter	70.8 mm (f/1.2)	75.0 mm (f/1.8)	Nearly identical distant background blur size at equal framing.
Minimum Focus Distance	0.85 m	0.7 m	Canon RF 135mm F1.8 L IS USM focuses 15 cm closer (0.85 m vs. 0.7 m) for tighter close-ups.
Patent Prescription	US20200012073A1 (14/9)	US20230213745A1 (17/12)	Published optical prescriptions traced in the 3D simulator above.

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Pytania

Which blurs the background more, Canon RF 85mm F1.2 L USM or Canon RF 135mm F1.8 L IS USM?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Canon RF 85mm F1.2 L USM at f/1.2 has a 70.8 mm entrance pupil, while Canon RF 135mm F1.8 L IS USM at f/1.8 has a 75.0 mm entrance pupil.

How does working distance differ between Canon RF 85mm F1.2 L USM and Canon RF 135mm F1.8 L IS USM?

For an upper-body portrait, Canon RF 85mm F1.2 L USM stands 3.41 m from the subject (sharp zone 17 cm, from 3.33 m to 3.49 m), whereas Canon RF 135mm F1.8 L IS USM stands 5.40 m away (sharp zone 25 cm, from 5.28 m to 5.53 m).

How do the optical designs of Canon RF 85mm F1.2 L USM and Canon RF 135mm F1.8 L IS USM compare?

Canon RF 85mm F1.2 L USM uses 14 elements in 9 groups (US20200012073A1, effective focal length 88.4 mm at portrait distance). Canon RF 135mm F1.8 L IS USM uses 17 elements in 12 groups (US20230213745A1, effective focal length 132.7 mm).

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Zobacz też: głębia ostrości, bokeh, współczynnik crop, kompresja.