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
Panasonic
LUMIX S 18mm F1.8
Leica L Mount
LUMIX S 18mm F1.8 — 18mm f/1.8 for Leica L, a popular choice in the panasonic lineup.
$599
Launch priceReleased Nov 2022
LUMIX S 18mm F1.8 is 3.9 years newer.
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Wins
RF 50mm F1.2L USM
Wins
LUMIX S 18mm F1.8
1 categories tied
Which would you choose?
TL;DR — Key differences
- BLUMIX S 18mm F1.8 has lower Weight (340 g vs 950 g)
- BLUMIX S 18mm F1.8 has lower Min focus distance (20 cm vs 40 cm)
- ARF 50mm F1.2L USM has lower Max aperture (Wide) (f/1.2 vs f/1.8)
- ARF 50mm F1.2L USM has lower Max aperture (Tele) (f/1.2 vs f/1.8)
- BLUMIX S 18mm F1.8 has lower Diameter (67 mm vs 89.8 mm)
Key specs at a glance
Size and weight, to scale
📸 Snap this lens size diff to share
RF 50mm F1.2L USM
⌀90 × 108 mm
950 g (2.09 lb / 33.51 oz)
Credit card
85.6 × 54 mm
for scale
LUMIX S 18mm F1.8
⌀67 × 87 mm
340 g (0.75 lb / 11.99 oz)
RF 50mm F1.2L USM is 22mm longer and 23mm wider than LUMIX S 18mm F1.8.
RF 50mm F1.2L USM is 610 g heavier than LUMIX S 18mm F1.8.
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
- ✓
Control ring
Only RF 50mm F1.2L USM supports it
- ✓
Max aperture (Wide)
f/1.2 vs f/1.8 — lower is better
- ✓
Max aperture (Tele)
f/1.2 vs f/1.8 — lower is better
Reasons to choose the LUMIX S 18mm F1.8
- ✓
Special elements
Adds 2 Aspherical, 1 ED
- ✓
Weight
340 g vs 950 g — lower is better
- ✓
Min focus distance
20 cm vs 40 cm — lower is better
- ✓
Diameter
67 mm vs 89.8 mm — lower is better
- ✓
Length
86.5 mm vs 108 mm — lower is better
- ✓
Max magnification
0.2 × vs 0.19 × — higher is better
Shared specifications
Internal focus
Both support internal focus
Weather sealing
Both support weather sealing
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
LUMIX S 18mm F1.8
Pros
- ✓Prime design typically delivers strong sharpness and lighter weight
- ✓Lightweight design easy to carry all day
- ✓Native Leica L mount compatibility
Cons
- –Third-party or older alternatives may offer better value
Decided which one is right for you?
Compare live prices for the RF 50mm F1.2L USM and LUMIX S 18mm F1.8 at major authorized retailers.
Canon RF 50mm F1.2L USM
Panasonic LUMIX S 18mm F1.8
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Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.