Does the Canon RF 100-500mm f/4.5-7.1 L IS USM work with a teleconverter?

Canon RF Extender 2x: partially (Same hard restriction: 300-500mm only. The resulting f/9-14 is computed, not a Canon figure.) — giving 600-1000mm over that restricted range at f/9-14. Canon RF Extender 1.4x: partially (Canon: 'Extenders can only be used from a 300-500mm range (cannot be used from 100-299mm).' Stated for extenders generally, so it binds the 1.4x. Aperture is computed, not a Canon figure.) — giving 420-700mm over that restricted range at f/6.3-10.

How much reach does a teleconverter add to the Canon RF 100-500mm f/4.5-7.1 L IS USM?

A 2x takes it from 300-500mm to 600-1000mm, costing 2 stops of light (f/4.5-7.1 becomes f/9-14). A 1.4x takes it from 300-500mm to 420-700mm, costing 1 stop of light (f/4.5-7.1 becomes f/6.3-10).

Does the Canon RF 100-500mm f/4.5-7.1 L IS USM take a teleconverter?

Canon RF · 100-500mm f/4.5-7.1 · thread and mount data verified 2026-09-02

2 teleconverters are 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: Canon: 'Extenders can only be used from a 300-500mm range (cannot be used from 100-299mm).' Stated for extenders generally, so it binds the 1.4x. Aperture is computed, not a Canon figure. That is a published limit, not a reviewer's opinion — the usable range with a converter fitted is narrower than the lens's own.

Canon RF Extender 2xSee price on Amazon

Canon RF Extender 1.4x

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Teleconverter	Supported	Reach	Max aperture	On APS-C	On Micro Four Thirds
Canon RF Extender 1.4x	Partial — Canon: 'Extenders can only be used from a 300-500mm range (cannot be used from 100-299mm).' Stated for extenders generally, so it binds the 1.4x. Aperture is computed, not a Canon figure.	420-700mm (restricted range — see note)	f/6.3-10	224-1120mm	—
Canon RF Extender 2x	Partial — Same hard restriction: 300-500mm only. The resulting f/9-14 is computed, not a Canon figure.	600-1000mm (restricted range — see note)	f/9-14	320-1600mm	—

At f/9-14 some older bodies restrict autofocus to the centre point.

What each converter gives you

Canon RF Extender 2x — 600-1000mm over its restricted range at f/9-14 on this lens.

Canon RF Extender 1.4x — 420-700mm over its restricted range at f/6.3-10 on this lens.

The lens itself: Canon RF 100-500mm f/4.5-7.1 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 2026-09-02. 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