Does the Canon RF 600mm f/4 L IS USM take a teleconverter?

Canon RF · 600mm f/4 · thread and mount data verified 2026-08-29

One teleconverter is supported. A teleconverter multiplies the focal length and costs you light — and on a crop body the framing multiplies again.

Only the 2x is supported here, giving 1200mm at f/8 — comfortably inside the autofocus range of current bodies.

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Teleconverter	Supported	Reach	Max aperture	On APS-C	On Micro Four Thirds
Canon RF Extender 2x	Yes — The f/8 at 1200mm figure is computed from the lens aperture, not a Canon-published number. Compatibility itself is on Canon’s extender list.	1200mm	f/8	1920mm	—

At f/8 some older bodies restrict autofocus to the centre point.

What each converter gives you

Canon RF Extender 2x — 1200mm at f/8 on this lens.

The lens itself: Canon RF 600mm f/4 L IS USM · 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