Canon
RF 135mm F1.8 L IS USM
Canon RF Mount
RF 135mm F1.8 L IS USM — 135mm f/1.8 for Canon RF, a popular choice in the canon lineup.
$2,099
Launch priceReleased Aug 2023
Sony
FE 50mm F1.4 GM
Sony E Mount
FE 50mm F1.4 GM — 50mm f/1.4 for Sony E, a popular choice in the sony lineup.
$1,799
Launch priceReleased Feb 2023
RF 135mm F1.8 L IS USM is 6 months newer.
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Wins
RF 135mm F1.8 L IS USM
Wins
FE 50mm F1.4 GM
Which would you choose?
TL;DR — Key differences
- ARF 135mm F1.8 L IS USM has higher OIS effectiveness (5.5 stops vs 0 stops)
- ARF 135mm F1.8 L IS USM has higher Max magnification (0.29 × vs 0.16 ×)
- BFE 50mm F1.4 GM has lower Weight (516 g vs 935 g)
- BFE 50mm F1.4 GM has lower Min focus distance (41 cm vs 70 cm)
- BFE 50mm F1.4 GM has lower Length (96 mm vs 130.4 mm)
Key specs at a glance
Size and weight, to scale
📸 Snap this lens size diff to shareRF 135mm F1.8 L IS USM
⌀89 × 130 mm
935 g (2.06 lb / 32.98 oz)
Credit card
85.6 × 54 mm
for scale
FE 50mm F1.4 GM
⌀81 × 96 mm
516 g (1.14 lb / 18.20 oz)
RF 135mm F1.8 L IS USM is 34mm longer and 8mm wider than FE 50mm F1.4 GM.
RF 135mm F1.8 L IS USM is 419 g heavier than FE 50mm F1.4 GM.
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 135mm F1.8 L IS USM
- ✓
Special elements
Adds 1 UD, 1 Aspherical
- ✓
OIS effectiveness
5.5 stops vs 0 stops — higher is better
- ✓
Optical stabilization
Only RF 135mm F1.8 L IS USM supports it
- ✓
Max magnification
0.29 × vs 0.16 × — higher is better
Reasons to choose the FE 50mm F1.4 GM
- ✓
Special elements
Adds Aspherical, ED
- ✓
Weight
516 g vs 935 g — lower is better
- ✓
Min focus distance
41 cm vs 70 cm — lower is better
- ✓
Length
96 mm vs 130.4 mm — lower is better
- ✓
Max aperture (Wide)
f/1.4 vs f/1.8 — lower is better
- ✓
Max aperture (Tele)
f/1.4 vs f/1.8 — lower is better
- ✓
Diameter
80.6 mm vs 89 mm — lower is better
Shared specifications
Internal focus
Both support internal focus
Weather sealing
Both support weather sealing
Control ring
Both support control ring
Custom function button
Both support custom function button
Pros & cons at a glance
Editorially curated highlights and trade-offs.
RF 135mm F1.8 L IS USM
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
FE 50mm F1.4 GM
Pros
- ✓Bright f/1.4 aperture for low light and subject separation
- ✓Prime design typically delivers strong sharpness and lighter weight
- ✓Weather-sealed construction for outdoor shooting
Cons
- –Third-party or older alternatives may offer better value
Decided which one is right for you?
Compare live prices for the RF 135mm F1.8 L IS USM and FE 50mm F1.4 GM at major authorized retailers.
Canon RF 135mm F1.8 L IS USM
Sony FE 50mm F1.4 GM
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Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed August 2026.