Canon RF 100-400mm f/5.6-8 IS USM
The RF 100-400mm f/5.6-8 IS USM is a beginner-tier (59) full-frame RF telephoto zoom, stabilized, with a 67mm filter thread at just 635g. Its light weight and reach make it a budget option for casual wildlife and field shooting. The narrow f/5.6-8 aperture is the limiting factor, so it's not the lens for low-light telephoto work.
Scores
BreakdownHideOverall62±3Caliber-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 | Canon RFSourced | Sourced |
| coverage | Full-frameSourced | Sourced |
| focal length | 100 400mmSourced | Sourced |
| max aperture | f/5.6-8Sourced | Sourced |
| filter thread (mm) | 67Sourced | Sourced |
| stabilized | yesSourced | Sourced |
| weight (g) | 635Sourced | Sourced |
7/7 detail specs sourced. Amber rows are flagged for verification — we show them as reported, not confirmed.
Verdict
Best for
- Budget RF wildlife/field reach
Who should skip this
- Low light tele
Where to buy
List price $750
Prices are a guide and can change — confirm the current price on the retailer's site before buying.
Prices last checked Jun 17, 2026 — retailer prices change often, so click through for the current price.
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Ecosystem
Compatibility
Built around Canon RF 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
Buying today, the Canon RF 85mm f/2 Macro IS STM scores higher for less — the smarter pick in lenses unless you specifically want this one. See it →