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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 9
Tamron 50-400mm f/4.5-6.3 Di III VC VXD — Prime/zoom
Tamron

Tamron 50-400mm f/4.5-6.3 Di III VC VXD

Prime/zoom

87
/ 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 50-400mm f/4.5-6.3 Di III VC VXD at 87. That puts Canon RF 28-70mm f/2L USM ahead by 9 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 50-400mm f/4.5-6.3 Di III VC VXD if…

  • ✓Proven optical formula
  • ✓Weather-sealing (L/GM/S)
  • ✓Strong resale
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Winner by scenario

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

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 90).

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 87).

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 83).

Value for money

Tamron 50-400mm f/4.5-6.3 Di III VC VXD

Specdex score per dollar at MSRP

Tamron 50-400mm f/4.5-6.3 Di III VC VXD more score per dollar ($1,299 vs $2,999).

Canon RF 28-70mm f/2L USM 96
vs
87 Tamron 50-400mm f/4.5-6.3 Di III VC VXD

Score breakdown

Canon RF 28-70mm f/2L USM
96
sharpness 96
af 95
build 94
value 84
Tamron 50-400mm f/4.5-6.3 Di III VC VXD
87
sharpness 87
af 83
build 90
value 86

Specs side-by-side

Canon RF 28-70mm f/2L USM versus Tamron 50-400mm f/4.5-6.3 Di III VC VXD — full spec comparison
Spec Canon RF 28-70mm f/2L USM Tamron 50-400mm f/4.5-6.3 Di III VC VXD

Canon RF 28-70mm f/2L USM

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

Tamron 50-400mm f/4.5-6.3 Di III VC VXD

Pros
  • +Proven optical formula
  • +Weather-sealing (L/GM/S)
  • +Strong resale
Cons
  • −Mount-specific
  • −Older AF motor on some
  • −Heavier than modern counterparts

FAQ: Canon RF 28-70mm f/2L USM vs Tamron 50-400mm f/4.5-6.3 Di III VC VXD

Which is better, Canon RF 28-70mm f/2L USM or Tamron 50-400mm f/4.5-6.3 Di III VC VXD? +

Canon RF 28-70mm f/2L USM scores 96 on our weighted rubric — ahead by 9. 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 50-400mm f/4.5-6.3 Di III VC VXD worth the price? +

At $1,299, Tamron 50-400mm f/4.5-6.3 Di III VC VXD delivers a Specdex score of 87 — strongest in build.

Does Canon RF 28-70mm f/2L USM or Tamron 50-400mm f/4.5-6.3 Di III VC VXD 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 build, Canon RF 28-70mm f/2L USM or Tamron 50-400mm f/4.5-6.3 Di III VC VXD? +

Canon RF 28-70mm f/2L USM — leads on build (94 vs 90). Compared on the build sub-score.

Which is better for sharpness, Canon RF 28-70mm f/2L USM or Tamron 50-400mm f/4.5-6.3 Di III VC VXD? +

Canon RF 28-70mm f/2L USM — leads on sharpness (96 vs 87). Compared on the sharpness sub-score.