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Canon RF 100-400mm f/5.6-8 — Prime/Zoom
Canon

Canon RF 100-400mm f/5.6-8

Prime/Zoom

84
/ 100
From $649
VS
Canon EF 70-200mm f/2.8L IS III USM wins by 8
Canon EF 70-200mm f/2.8L IS III USM — Prime/zoom
Canon

Canon EF 70-200mm f/2.8L IS III USM

Prime/zoom

92
/ 100
From $2,099
Specdex verdict

Canon EF 70-200mm f/2.8L IS III USM takes it — here’s why.

In our weighted Specdex score, Canon RF 100-400mm f/5.6-8 lands at 84 and Canon EF 70-200mm f/2.8L IS III USM at 92. That puts Canon EF 70-200mm f/2.8L IS III USM ahead by 8 points — a decisive margin driven mostly by its strengths in the categories below.

Pick Canon RF 100-400mm f/5.6-8 if…

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

Pick Canon EF 70-200mm f/2.8L IS III USM 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 EF 70-200mm f/2.8L IS III USM

Compared on the build sub-score

Canon EF 70-200mm f/2.8L IS III USM leads on build (90 vs 88).

Sharpness

Canon EF 70-200mm f/2.8L IS III USM

Compared on the sharpness sub-score

Canon EF 70-200mm f/2.8L IS III USM leads on sharpness (92 vs 84).

Autofocus

Canon EF 70-200mm f/2.8L IS III USM

Compared on the autofocus sub-score

Canon EF 70-200mm f/2.8L IS III USM leads on af (88 vs 82).

Value for money

Canon RF 100-400mm f/5.6-8

Specdex score per dollar at MSRP

Canon RF 100-400mm f/5.6-8 more score per dollar ($649 vs $2,099).

Canon RF 100-400mm f/5.6-8 84
vs
92 Canon EF 70-200mm f/2.8L IS III USM

Score breakdown

Canon RF 100-400mm f/5.6-8
84
sharpness 84
af 82
build 88
value 85
Canon EF 70-200mm f/2.8L IS III USM
92
sharpness 92
af 88
build 90
value 86

Specs side-by-side

Canon RF 100-400mm f/5.6-8 versus Canon EF 70-200mm f/2.8L IS III USM — full spec comparison
Spec Canon RF 100-400mm f/5.6-8 Canon EF 70-200mm f/2.8L IS III USM

Canon RF 100-400mm f/5.6-8

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

Canon EF 70-200mm f/2.8L IS III USM

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 100-400mm f/5.6-8 vs Canon EF 70-200mm f/2.8L IS III USM

Which is better, Canon RF 100-400mm f/5.6-8 or Canon EF 70-200mm f/2.8L IS III USM? +

Canon EF 70-200mm f/2.8L IS III USM scores 92 on our weighted rubric — ahead by 8. Your best pick depends on the sub-scores above.

Is Canon RF 100-400mm f/5.6-8 worth the price? +

At $649, Canon RF 100-400mm f/5.6-8 delivers a Specdex score of 84 — strongest in build.

Is Canon EF 70-200mm f/2.8L IS III USM worth the price? +

At $2,099, Canon EF 70-200mm f/2.8L IS III USM delivers a Specdex score of 92 — strongest in sharpness.

Does Canon RF 100-400mm f/5.6-8 or Canon EF 70-200mm f/2.8L IS III USM 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 100-400mm f/5.6-8 or Canon EF 70-200mm f/2.8L IS III USM? +

Canon EF 70-200mm f/2.8L IS III USM — leads on build (90 vs 88). Compared on the build sub-score.

Which is better for sharpness, Canon RF 100-400mm f/5.6-8 or Canon EF 70-200mm f/2.8L IS III USM? +

Canon EF 70-200mm f/2.8L IS III USM — leads on sharpness (92 vs 84). Compared on the sharpness sub-score.