Canon
RF 70-200mm F2.8L IS USM
Canon RF Mount
An incredibly compact, extending telephoto zoom with L-series optics and 5 stops of stabilization.
$2,799
Launch priceReleased Oct 2019
Tamron
17-28mm F2.8 Di III RXD
Leica L Mount
17-28mm F2.8 Di III RXD — 17–28mm f/2.8 for Leica L, a popular choice in the tamron lineup.
$799
Launch priceReleased Jun 2020
17-28mm F2.8 Di III RXD is 8 months newer.
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Wins
RF 70-200mm F2.8L IS USM
Wins
17-28mm F2.8 Di III RXD
2 categories tied
TL;DR — Key differences
- ARF 70-200mm F2.8L IS USM has higher OIS effectiveness (5 stops vs 0 stops)
- B17-28mm F2.8 Di III RXD has lower Min focus distance (19 cm vs 70 cm)
- B17-28mm F2.8 Di III RXD has lower Weight (438 g vs 1070 g)
- B17-28mm F2.8 Di III RXD has lower Length (92 mm vs 146 mm)
- ARF 70-200mm F2.8L IS USM has higher Max magnification (0.23 × vs 0.19 ×)
Key specs at a glance
Size and weight, to scale
RF 70-200mm F2.8L IS USM
⌀90 × 146 mm
1070 g (2.36 lb / 37.74 oz)
Credit card
85.6 × 54 mm
for scale
17-28mm F2.8 Di III RXD
⌀80 × 92 mm
438 g (0.97 lb / 15.45 oz)
RF 70-200mm F2.8L IS USM is 54mm longer and 10mm wider than 17-28mm F2.8 Di III RXD.
RF 70-200mm F2.8L IS USM is 632 g heavier than 17-28mm F2.8 Di III RXD.
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 70-200mm F2.8L IS USM
- ✓
Special elements
Adds 1 Super UD, 1 UD, 2 Aspherical
- ✓
OIS effectiveness
5 stops vs 0 stops — higher is better
- ✓
Optical stabilization
Only RF 70-200mm F2.8L IS USM supports it
- ✓
Control ring
Only RF 70-200mm F2.8L IS USM supports it
- ✓
Max magnification
0.23 × vs 0.19 × — higher is better
Reasons to choose the 17-28mm F2.8 Di III RXD
- ✓
Special elements
Adds 1 LD, 2 GM Aspherical
- ✓
Min focus distance
19 cm vs 70 cm — lower is better
- ✓
Weight
438 g vs 1070 g — lower is better
- ✓
Internal focus
Only 17-28mm F2.8 Di III RXD supports it
- ✓
Length
92 mm vs 146 mm — lower is better
- ✓
Diameter
79.6 mm vs 90 mm — lower is better
Shared specifications
Max aperture (Wide)
Both f/2.8
Max aperture (Tele)
Both f/2.8
Weather sealing
Both support weather sealing
Pros & cons at a glance
Editorially curated highlights and trade-offs.
RF 70-200mm F2.8L IS USM
Pros
- ✓Unbelievably compact storage size thanks to extending barrel
- ✓Very lightweight design (only 1070g)
- ✓Excellent center sharpness at all focal lengths
- ✓Dual Nano USM focus motors offer fast, silent AF
- ✓Exceptional 5-stop optical image stabilization
Cons
- –Extending barrel can draw in dust/moisture over time
- –Not compatible with RF teleconverters (due to rear element position)
- –Vignetting is quite heavy wide open
17-28mm F2.8 Di III RXD
Pros
- ✓Versatile zoom range covers multiple focal lengths in one lens
- ✓Solid optical performance for the price tier
- ✓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 70-200mm F2.8L IS USM and 17-28mm F2.8 Di III RXD at major authorized retailers.
Canon RF 70-200mm F2.8L IS USM
Tamron 17-28mm F2.8 Di III RXD
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Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.