Does the Canon RF 200-800mm f/6.3-9 IS USM work with a teleconverter?

Canon RF Extender 2x: yes (Compatible across the entire zoom range. The resulting f/12.6-18 is computed, not a Canon figure. AUDIT-VERIFIED verbatim.) — giving 400-1600mm at f/13-18. Canon RF Extender 1.4x: yes (On Canon's Extender RF1.4x compatibility list; Canon states compatibility at all focal lengths. Aperture is computed, not a Canon figure.) — giving 280-1120mm at f/9-13.

How much reach does a teleconverter add to the Canon RF 200-800mm f/6.3-9 IS USM?

A 2x takes it from 200-800mm to 400-1600mm, costing 2 stops of light (f/6.3-9 becomes f/13-18). A 1.4x takes it from 200-800mm to 280-1120mm, costing 1 stop of light (f/6.3-9 becomes f/9-13).

Does the Canon RF 200-800mm f/6.3-9 IS USM take a teleconverter?

Canon RF · 200-800mm f/6.3-9 · 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.

The 1.4x is the safer buy: 280-1120mm at f/9-13, inside the autofocus range of current bodies. The 2x reaches 400-1600mm but lands at f/13-18, where many bodies restrict autofocus to the centre point — the extra reach is paid for in focus performance, not just light.

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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	Yes — On Canon's Extender RF1.4x compatibility list; Canon states compatibility at all focal lengths. Aperture is computed, not a Canon figure.	280-1120mm	f/9-13	448-1792mm	—
Canon RF Extender 2x	Yes — Compatible across the entire zoom range. The resulting f/12.6-18 is computed, not a Canon figure. AUDIT-VERIFIED verbatim.	400-1600mm	f/13-18	640-2560mm	—

At f/13-18 autofocus is limited on many bodies (often centre-point only). Check your body's AF aperture limit. At f/9-13 some older bodies restrict autofocus to the centre point.

What each converter gives you

Canon RF Extender 2x — 400-1600mm at f/13-18 on this lens.

Canon RF Extender 1.4x — 280-1120mm at f/9-13 on this lens.

The lens itself: Canon RF 200-800mm f/6.3-9 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