Canon
RF 50mm F1.2L USM
Canon RF Mount
Flagship RF 50mm f/1.2 L prime with Ring USM, 15-element design, and weather-sealed L-series build.
$2,299
Launch priceReleased Dec 2018
OM System
M.Zuiko Digital ED 300mm F4 IS PRO
Micro Four Thirds Mount
600mm-equiv. F4 super-telephoto with Sync IS (6 stops), 1475g weight, removable rotating tripod collar, and PRO weather sealing.
$3,499
Launch priceReleased Feb 2016
RF 50mm F1.2L USM is 2.8 years newer.
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Wins
RF 50mm F1.2L USM
Wins
M.Zuiko Digital ED 300mm F4 IS PRO
Which would you choose?
TL;DR — Key differences
- BM.Zuiko Digital ED 300mm F4 IS PRO has higher OIS effectiveness (4 stops vs 0 stops)
- ARF 50mm F1.2L USM has lower Min focus distance (40 cm vs 140 cm)
- ARF 50mm F1.2L USM has lower Max aperture (Wide) (f/1.2 vs f/4)
- ARF 50mm F1.2L USM has lower Max aperture (Tele) (f/1.2 vs f/4)
- ARF 50mm F1.2L USM has lower Length (108 mm vs 227 mm)
Key specs at a glance
Size and weight, to scale
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RF 50mm F1.2L USM
⌀90 × 108 mm
950 g (2.09 lb / 33.51 oz)
Credit card
85.6 × 54 mm
for scale
M.Zuiko Digital ED 300mm F4 IS PRO
⌀93 × 227 mm
1475 g (3.25 lb / 52.03 oz)
RF 50mm F1.2L USM is 119mm shorter and 3mm narrower than M.Zuiko Digital ED 300mm F4 IS PRO.
RF 50mm F1.2L USM is 525 g lighter than M.Zuiko Digital ED 300mm F4 IS PRO.
Diameter (⌀) is the maximum barrel width; length is measured from the mount to the front of the lens.
Use-case scoring
Which one for what?
Algorithmic scores from verified specs · 10 = best in class
Why pick one over the other
Reasons to choose the RF 50mm F1.2L USM
- ✓
Special elements
Adds 1 UD, 1 Aspherical
- ✓
Min focus distance
40 cm vs 140 cm — lower is better
- ✓
Max aperture (Wide)
f/1.2 vs f/4 — lower is better
- ✓
Max aperture (Tele)
f/1.2 vs f/4 — lower is better
- ✓
Length
108 mm vs 227 mm — lower is better
- ✓
Weight
950 g vs 1475 g — lower is better
- ✓
Diameter
89.8 mm vs 92.5 mm — lower is better
Reasons to choose the M.Zuiko Digital ED 300mm F4 IS PRO
- ✓
Special elements
Adds 3 Super ED, 3 HR, 1 E-HR
- ✓
OIS effectiveness
4 stops vs 0 stops — higher is better
- ✓
Optical stabilization
Only M.Zuiko Digital ED 300mm F4 IS PRO supports it
- ✓
Custom function button
Only M.Zuiko Digital ED 300mm F4 IS PRO supports it
- ✓
Max magnification
0.24 × vs 0.19 × — higher is better
Shared specifications
Internal focus
Both support internal focus
Weather sealing
Both support weather sealing
Control ring
Both support control ring
Pros & cons at a glance
Editorially curated highlights and trade-offs.
RF 50mm F1.2L USM
Pros
- ✓Stunning sharpness even wide open at f/1.2
- ✓Beautiful, smooth bokeh with 10 rounded aperture blades
- ✓Fast and accurate Dual Pixel AF with Ring USM
- ✓Weather-sealed L-series construction
Cons
- –Heavy for a 50mm prime (950g)
- –Premium price for a single focal length
- –No optical image stabilization
M.Zuiko Digital ED 300mm F4 IS PRO
Pros
- ✓Prime design typically delivers strong sharpness and lighter weight
- ✓Built-in optical image stabilization
- ✓Weather-sealed construction for outdoor shooting
Cons
- –Premium price point
- –Relatively heavy for extended handheld use
- –Slower maximum aperture limits low-light performance
Decided which one is right for you?
Compare live prices for the RF 50mm F1.2L USM and M.Zuiko Digital ED 300mm F4 IS PRO at major authorized retailers.
Canon RF 50mm F1.2L USM
OM System M.Zuiko Digital ED 300mm F4 IS PRO
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Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.