Sony FE 100-400mm f/4.5-5.6 GM OSS (SEL100400GM)
A pro-tier E-mount telephoto zoom covering 100-400mm with OSS, a 77mm thread and 1395g weight, compatible with Sony's 1.4x and 2x teleconverters. It's built for wildlife, birding and sports reach. The variable f/4.5-5.6 aperture limits low-light tele work, and buyers should know the data flags it as the established model rather than the newer constant-f/4.5 GM II; treat it as a proven, versatile reach lens.
Scores
BreakdownHideOverall72±6Caliber-forward blend — tier caliber + within-tier price rank 30%, value 25%, confidence 20%, compatibility 15%, upgrade path 10% — renormalized over applicable dimensions.
Scores
BreakdownHideCaliber-forward blend — tier caliber + within-tier price rank 30%, value 25%, confidence 20%, compatibility 15%, upgrade path 10% — renormalized over applicable dimensions.
The ± band on the overall score reflects sourcing confidence — wider when fewer specs are verified.
How each score is computed: our scoring methodology.
Specifications
| Spec | Value | Verification |
|---|---|---|
| mount | Sony ESourced | Sourced |
| coverage | Full-frameSourced | Sourced |
| focal length | 100 400mmSourced | Sourced |
| max aperture | f/4.5-5.6Sourced | Sourced |
| filter thread (mm) | 77Sourced | Sourced |
| stabilized | yesSourced | Sourced |
| weight (g) | 1395Sourced | Sourced |
7/7 detail specs sourced. Amber rows are flagged for verification — we show them as reported, not confirmed.
Verdict
Best for
- Wildlife, birding and sports reach on E-mount
- Teleconverter use (SEL14TC/SEL20TC compatible)
Who should skip this
- Low-light tele (variable f/4.5-5.6)
- Buyers wanting the newer constant-f/4.5 GM II - this is the established model
Where to buy
List price $2,698
Prices are a guide and can change — confirm the current price on the retailer's site before buying.
Prices last checked Jul 7, 2026 — retailer prices change often, so click through for the current price.
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Ecosystem
Compatibility
Built around Sony E-mount. Make sure the rest of your build uses the same platform before you buy — mismatched sockets, mounts or standards are the most common return reason. Check it in the builder →
Upgrade path
A top-tier lens — there's little to upgrade to within the category.