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Canon RF 28-70mm f/2L USM — Prime/Zoom
Canon

Canon RF 28-70mm f/2L USM

Prime/Zoom

96
/ 100
From $2,999
VS
Canon RF 28-70mm f/2L USM wins by 6
Tamron 70-180mm f/2.8 Di III VC VXD G2 — Prime/Zoom
Tamron

Tamron 70-180mm f/2.8 Di III VC VXD G2

Prime/Zoom

90
/ 100
From $1,299
Specdex verdict

Canon RF 28-70mm f/2L USM takes it — here’s why.

In our weighted Specdex score, Canon RF 28-70mm f/2L USM lands at 96 and Tamron 70-180mm f/2.8 Di III VC VXD G2 at 90. That puts Canon RF 28-70mm f/2L USM ahead by 6 points — a decisive margin driven mostly by its strengths in the categories below.

Pick Canon RF 28-70mm f/2L USM if…

  • ✓Fast autofocus
  • ✓Weather-sealed
  • ✓Premium optics

Pick Tamron 70-180mm f/2.8 Di III VC VXD G2 if…

  • ✓Fast aperture
  • ✓Quiet autofocus
  • ✓Weather-sealed (most)
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Winner by scenario

Derived from the sub-score breakdown · not a separate test

Sharpness

Canon RF 28-70mm f/2L USM

Compared on the sharpness sub-score

Canon RF 28-70mm f/2L USM leads on sharpness (96 vs 90).

Autofocus

Canon RF 28-70mm f/2L USM

Compared on the autofocus sub-score

Canon RF 28-70mm f/2L USM leads on af (95 vs 88).

Build

Canon RF 28-70mm f/2L USM

Compared on the build sub-score

Canon RF 28-70mm f/2L USM leads on build (94 vs 88).

Value for money

Tamron 70-180mm f/2.8 Di III VC VXD G2

Specdex score per dollar at MSRP

Tamron 70-180mm f/2.8 Di III VC VXD G2 more score per dollar ($1,299 vs $2,999).

Canon RF 28-70mm f/2L USM 96
vs
90 Tamron 70-180mm f/2.8 Di III VC VXD G2

Score breakdown

Canon RF 28-70mm f/2L USM
96
sharpness 96
af 95
build 94
value 84
Tamron 70-180mm f/2.8 Di III VC VXD G2
90
sharpness 90
af 88
build 88
value 85

Specs side-by-side

Canon RF 28-70mm f/2L USM versus Tamron 70-180mm f/2.8 Di III VC VXD G2 — full spec comparison
Spec Canon RF 28-70mm f/2L USM Tamron 70-180mm f/2.8 Di III VC VXD G2

Canon RF 28-70mm f/2L USM

Pros
  • +Fast autofocus
  • +Weather-sealed
  • +Premium optics
Cons
  • −Heavy
  • −Expensive
  • −Focus breathing varies

Tamron 70-180mm f/2.8 Di III VC VXD G2

Pros
  • +Fast aperture
  • +Quiet autofocus
  • +Weather-sealed (most)
Cons
  • −Mount-specific
  • −Weight varies
  • −Price scales with quality

FAQ: Canon RF 28-70mm f/2L USM vs Tamron 70-180mm f/2.8 Di III VC VXD G2

Which is better, Canon RF 28-70mm f/2L USM or Tamron 70-180mm f/2.8 Di III VC VXD G2? +

Canon RF 28-70mm f/2L USM scores 96 on our weighted rubric — ahead by 6. Your best pick depends on the sub-scores above.

Is Canon RF 28-70mm f/2L USM worth the price? +

At $2,999, Canon RF 28-70mm f/2L USM delivers a Specdex score of 96 — strongest in sharpness.

Is Tamron 70-180mm f/2.8 Di III VC VXD G2 worth the price? +

At $1,299, Tamron 70-180mm f/2.8 Di III VC VXD G2 delivers a Specdex score of 90 — strongest in sharpness.

Does Canon RF 28-70mm f/2L USM or Tamron 70-180mm f/2.8 Di III VC VXD G2 last longer? +

Based on our long-term update and support ratings, both ship with multi-year support. Battery and reliability scores are visible in the breakdown above.

Which is better for sharpness, Canon RF 28-70mm f/2L USM or Tamron 70-180mm f/2.8 Di III VC VXD G2? +

Canon RF 28-70mm f/2L USM — leads on sharpness (96 vs 90). Compared on the sharpness sub-score.

Which is better for autofocus, Canon RF 28-70mm f/2L USM or Tamron 70-180mm f/2.8 Di III VC VXD G2? +

Canon RF 28-70mm f/2L USM — leads on af (95 vs 88). Compared on the autofocus sub-score.