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Tamron 28-75mm f/2.8 Di III VXD G2 — Sony E · f/2.8 · 540g · $899
Tamron

Tamron 28-75mm f/2.8 Di III VXD G2

Sony E · f/2.8 · 540g · $899

91
/ 100
From $899
VS
Nikon Z 100-400mm f/4.5-5.6 VR S — Prime/Zoom
Nikon

Nikon Z 100-400mm f/4.5-5.6 VR S

Prime/Zoom

91
/ 100
From $2,699
Specdex verdict

Dead heat — it comes down to priorities.

In our weighted Specdex score, Tamron 28-75mm f/2.8 Di III VXD G2 lands at 91 and Nikon Z 100-400mm f/4.5-5.6 VR S at 91. With scores tied, the decision hinges on which sub-scores matter most to you.

Pick Tamron 28-75mm f/2.8 Di III VXD G2 if…

  • ✓540g — lightest f/2.8 24-70 alternative
  • ✓Better than first-party G Master at $899
  • ✓Quiet VXD AF motor

Pick Nikon Z 100-400mm f/4.5-5.6 VR S 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

Tie

Compared on the sharpness sub-score

Effectively tied — neither pulls a 2-point weighted lead.

Autofocus

Tamron 28-75mm f/2.8 Di III VXD G2

Compared on the autofocus sub-score

Tamron 28-75mm f/2.8 Di III VXD G2 leads on af (92 vs 89).

Build

Tie

Compared on the build sub-score

Effectively tied — neither pulls a 2-point weighted lead.

Value for money

Tamron 28-75mm f/2.8 Di III VXD G2

Specdex score per dollar at MSRP

Tamron 28-75mm f/2.8 Di III VXD G2 more score per dollar ($899 vs $2,699).

Tamron 28-75mm f/2.8 Di III VXD G2 91
vs
91 Nikon Z 100-400mm f/4.5-5.6 VR S

Score breakdown

Tamron 28-75mm f/2.8 Di III VXD G2
91
sharpness 92
af 92
build 88
value 96
Nikon Z 100-400mm f/4.5-5.6 VR S
91
sharpness 91
af 89
build 88
value 85

Specs side-by-side

Tamron 28-75mm f/2.8 Di III VXD G2 versus Nikon Z 100-400mm f/4.5-5.6 VR S — full spec comparison
Spec Tamron 28-75mm f/2.8 Di III VXD G2 Nikon Z 100-400mm f/4.5-5.6 VR S
Mount
Sony E
—
Focal length
28-75 mm
—
Aperture
f/2.8
—
Construction
17 elements / 15 groups
—
Min focus
0.18 m
—
Filter
67 mm
—
Weight
540 g
—

Tamron 28-75mm f/2.8 Di III VXD G2

Pros
  • +540g — lightest f/2.8 24-70 alternative
  • +Better than first-party G Master at $899
  • +Quiet VXD AF motor
Cons
  • −28mm wide-end vs 24mm of Sony GM
  • −No image stabilization
  • −No fluorine front coating

Nikon Z 100-400mm f/4.5-5.6 VR S

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

FAQ: Tamron 28-75mm f/2.8 Di III VXD G2 vs Nikon Z 100-400mm f/4.5-5.6 VR S

Which is better, Tamron 28-75mm f/2.8 Di III VXD G2 or Nikon Z 100-400mm f/4.5-5.6 VR S? +

Both score 91 on our weighted rubric — tied. Your best pick depends on the sub-scores above.

Is Tamron 28-75mm f/2.8 Di III VXD G2 worth the price? +

At $899, Tamron 28-75mm f/2.8 Di III VXD G2 delivers a Specdex score of 91 — strongest in value.

Is Nikon Z 100-400mm f/4.5-5.6 VR S worth the price? +

At $2,699, Nikon Z 100-400mm f/4.5-5.6 VR S delivers a Specdex score of 91 — strongest in sharpness.

Does Tamron 28-75mm f/2.8 Di III VXD G2 or Nikon Z 100-400mm f/4.5-5.6 VR S 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 autofocus, Tamron 28-75mm f/2.8 Di III VXD G2 or Nikon Z 100-400mm f/4.5-5.6 VR S? +

Tamron 28-75mm f/2.8 Di III VXD G2 — leads on af (92 vs 89). Compared on the autofocus sub-score.

Which is the better value, Tamron 28-75mm f/2.8 Di III VXD G2 or Nikon Z 100-400mm f/4.5-5.6 VR S? +

Tamron 28-75mm f/2.8 Di III VXD G2 — more score per dollar ($899 vs $2,699). Specdex score per dollar at MSRP.