Sigma · Released Jun 2020 Last verified June 8, 2026

Sigma 100-400mm DG DN OS Review

Name: Sigma 100-400mm DG DN OS
Brand: Sigma

Prime/zoom

Specdex verdict Sigma's Sigma 100-400mm DG DN OS is a solid premium pick — strongly recommended, even if it doesn't unseat the category leaders.

Sigma Sigma 100-400mm DG DN OS — heritage professional lens.

All Sigma 100-400mm DG DN OS matchups → From $999

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Specdex verdict

Strongly Recommended

Specdex doesn't run benchmarks in-house. The verdict is an editorial assessment based on manufacturer specs and public reviewer consensus. See methodology.

Compare

Sigma 100-400mm DG DN OS versus its closest rivals

All matchups →

Editorial · Specdex take

Pros

+Proven optical formula
+Weather-sealing (L/GM/S)
+Strong resale

Cons

−Mount-specific
−Older AF motor on some
−Heavier than modern counterparts

Who's the Sigma 100-400mm DG DN OS for?

Quick verdicts for the most common buyer profiles, derived from the sub-scores above.

Power users and creators Skip

Compute scores trail current top-tier — look at our step-up alternatives below if performance is the priority.

Budget-conscious buyers Consider

Mid-tier pricing at $999 — review whether the score-per-dollar lines up against the cheaper alternatives we recommend.

In the box

What you get when you unbox the Sigma 100-400mm DG DN OS.

Lens
Front + rear caps
Lens hood (where applicable)
Soft pouch (premium tier)

Standard contents — region/SKU may vary; confirm at retailer.

Sources & benchmarks

Cited, not generated

Specdex does not run benchmarks in-house. We're rolling out cited public benchmark data category by category — PassMark for CPUs and GPUs is wired today; DXOMark, RTINGS, Geekbench, and NotebookCheck will follow.

Sources we use when available: PassMark for CPU/GPU, Geekbench Browser for synthetic, DXOMark for camera scores, RTINGS for TVs, monitors, and headphones. See methodology.