Does the Canon RF 600mm f/11 IS STM take a teleconverter?
One teleconverter is supported. A teleconverter multiplies the focal length and costs you light — and on a crop body the framing multiplies again.
Read the restriction before you buy: Same 'May lose AF functionality' disclaimer. 1200mm is the manufacturer figure; f/22 (computed from the lens aperture, not a manufacturer figure) — at or beyond most EOS R bodies' AF-capable aperture. Assume AF unreliable unless verified on the specific body. That is a published limit, not a reviewer's opinion — the usable range with a converter fitted is narrower than the lens's own.
| Teleconverter | Supported | Reach | Max aperture | On APS-C | On Micro Four Thirds |
|---|---|---|---|---|---|
| Canon RF Extender 2x | Partial — Same 'May lose AF functionality' disclaimer. 1200mm is the manufacturer figure; f/22 (computed from the lens aperture, not a manufacturer figure) — at or beyond most EOS R bodies' AF-capable aperture. Assume AF unreliable unless verified on the specific body. | 1200mm | f/22 | 1920mm | — |
What each converter gives you
Canon RF Extender 2x — 1200mm at f/22 on this lens.
The lens itself: Canon RF 600mm f/11 IS STM · every Canon RF lens: Canon RF lens index · all teleconverter compatibility
Compatibility sourced from the manufacturers' own published teleconverter compatibility statements (manufacturer teleconverter compatibility statements (Sony, Canon USA, Nikon, Fujifilm, Sigma, Panasonic, OM System) — each row carries its own source URL) and verified 2026-08-29. Reach and aperture figures are computed from the lens's own published focal length and maximum aperture — a 1.4x multiplies focal length by 1.4 and costs 1 stop; a 2x multiplies by 2 and costs 2 stops. Lenses whose compatibility we could not verify from a manufacturer statement are omitted rather than guessed. Methodology