Canon
RF 10-20mm F4 L IS USM
Canon RF Mount
RF 10-20mm F4 L IS USM — 10–20mm f/4 for Canon RF, a popular choice in the canon lineup.
$2,299
Launch priceReleased Oct 2023
Sony
FE 70-200mm F2.8 GM OSS II
Sony E Mount
The standard telephoto zoom, completely redesigned to be 29% lighter and significantly sharper.
$2,799
Launch priceReleased Oct 2021
RF 10-20mm F4 L IS USM is 2 years newer.
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Wins
RF 10-20mm F4 L IS USM
Wins
FE 70-200mm F2.8 GM OSS II
Which would you choose?
TL;DR — Key differences
- ARF 10-20mm F4 L IS USM has lower Length (112.8 mm vs 200 mm)
- BFE 70-200mm F2.8 GM OSS II has higher Max magnification (0.3 × vs 0.17 ×)
- ARF 10-20mm F4 L IS USM has lower Weight (620 g vs 1045 g)
- ARF 10-20mm F4 L IS USM has lower Min focus distance (24 cm vs 40 cm)
- BFE 70-200mm F2.8 GM OSS II has lower Max aperture (Wide) (f/2.8 vs f/4)
Key specs at a glance
Size and weight, to scale
📸 Snap this lens size diff to share
RF 10-20mm F4 L IS USM
⌀84 × 113 mm
620 g (1.37 lb / 21.87 oz)
Credit card
85.6 × 54 mm
for scale
FE 70-200mm F2.8 GM OSS II
⌀88 × 200 mm
1045 g (2.30 lb / 36.86 oz)
RF 10-20mm F4 L IS USM is 87mm shorter and 4mm narrower than FE 70-200mm F2.8 GM OSS II.
RF 10-20mm F4 L IS USM is 425 g lighter than FE 70-200mm F2.8 GM OSS II.
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 10-20mm F4 L IS USM
- ✓
Special elements
Adds 2 UD, 1 Super UD
- ✓
Control ring
Only RF 10-20mm F4 L IS USM supports it
- ✓
Length
112.8 mm vs 200 mm — lower is better
- ✓
Weight
620 g vs 1045 g — lower is better
- ✓
Min focus distance
24 cm vs 40 cm — lower is better
- ✓
OIS effectiveness
5.5 stops vs 4.5 stops — higher is better
- ✓
Diameter
83.6 mm vs 88 mm — lower is better
Reasons to choose the FE 70-200mm F2.8 GM OSS II
- ✓
Special elements
Adds 1 XA, 1 Super ED, 2 ED
- ✓
Max aperture (Wide)
f/2.8 vs f/4 — lower is better
- ✓
Max aperture (Tele)
f/2.8 vs f/4 — lower is better
- ✓
Max magnification
0.3 × vs 0.17 × — higher is better
Shared specifications
Internal focus
Both support internal focus
Optical stabilization
Both support optical stabilization
Weather sealing
Both support weather sealing
Custom function button
Both support custom function button
Pros & cons at a glance
Editorially curated highlights and trade-offs.
RF 10-20mm F4 L IS USM
Pros
- ✓Versatile zoom range covers multiple focal lengths in one lens
- ✓Built-in optical image stabilization
- ✓Weather-sealed construction for outdoor shooting
Cons
- –Premium price point
- –Slower maximum aperture limits low-light performance
FE 70-200mm F2.8 GM OSS II
Pros
- ✓Extremely lightweight for an f/2.8 telephoto zoom (only 1045g)
- ✓Virtually instantaneous and silent autofocus with 4 XD Linear motors
- ✓Stunning optical performance and contrast across entire range
- ✓Outstanding built-in Optical SteadyShot stabilization
- ✓Dedicated physical aperture ring with click and lock switches
Cons
- –Very high price tag
- –Lens hood is bulky and can block storage space easily
Decided which one is right for you?
Compare live prices for the RF 10-20mm F4 L IS USM and FE 70-200mm F2.8 GM OSS II at major authorized retailers.
Canon RF 10-20mm F4 L IS USM
Sony FE 70-200mm F2.8 GM OSS II
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Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.