The EXTENDER RF 2x is the perfect choice for enthusiast and professional photographers seeking more magnification from their RF lenses. Doubling focal length, it is ideal for press, nature and sport photographers.
Extend the reach of select Canon RF-mount lenses with the Extender RF 2x. This teleconverter magnifies the image by 2x and retains full communication between the lens and camera body, enabling metering, autofocus, and image stabilization as well as the transmission of Exif data. Additionally, the Extender RF is dust and water resistant and has a heat shield exterior to ensure optimal performance in a range of conditions.
The Extender RF 2x is the perfect choice for enthusiast and professional photographers seeking more magnification from their RF lenses. Doubling focal length, it is ideal for press, nature and sport photographers.
The extender features high-refraction, low-dispersion glass to control curvature of field and chromatic aberration of magnification for the highest image quality.
As well as optimised lens coatings, a 3-layer combined lens helps to reduce ghosting by reducing the surfaces in contact with the air as much as possible.
The exterior is coated in the same white heat shield coating as used on the RF 100-500mm F4.5-7.1L IS USM and RF 70-200mm lens to prevent deterioration in performance in high temperatures.
Optimum construction
9 lens elements, 5 groups
Compact design
71.2 x 39.3mm
Lightweight
340g
Extends a super telephoto lens’ focal length by 2x, so that an 800mm focal length, for example, becomes 1200mm. The extra reach makes it possible to get larger close-ups with the original camera resolution.
A large aperture lens placed near the image sensor, the use of high-refractive, low-dispersion glass, and three cemented lenses that minimise air contact surface suppress field curvature, lens aberration and flare and ghosting, hence optimising corner-to-corner image quality.
The lens features a vibration- and impact-resistant structure with a dust- and drip-resistant design, ready to withstand nature, motorsports, and other harsh professional and advanced shooting scenes.
Supporting heavy lenses is all in a day’s work for its robust, durable body.
Shooting at super-long focal lengths means a shallower depth-of-field, which can make focusing tricky. On the Extender RF 2x, built-in microprocessors communicate with the lens, achieving high-precision AF over an area as large as up to 80% x 80% (horizontal x vertical) of the focal plane* helping you to lock focus on your subjects more easily.
*With EOS R5 or R6 on the RF100-500mm f4.5-7.1L IS USM. Actual AF area depends on the lens, extender, and camera body.
Extenders, generally known as teleconverters, increase the effective focal length of lenses. Canon Extenders are available in two strengths, 1.4x and 2x. As the names suggest, the 1.4x Extender increases the focal length of your lens by a factor of 1.4, and the 2x by a factor of 2.
Canon EF Extenders are designed for use with a number of telephoto and zoom EF lenses. They do not work with EF-S or EF-M lenses. They can be used with a compatible EF lens on a Canon EOS R System camera with an EF-EOS R Mount Adapter. If you're using RF lenses, you need Canon RF Extenders, which are designed to work with certain RF lenses – more about these shortly.
Not all Canon lenses accept Canon Extenders. This is because of their construction – extenders have a protruding front element that will not fit into the rear of many EF lenses and some RF lenses. Compatible lenses have a recessed rear element, which creates space for the front element of the Extender.
(In the case of the RF 100-500mm f4.5-7.1 L IS USM, you need to zoom to at least 300mm in order to move the rear optical elements enough to fit an RF Extender. It is not physically possible to use the Extender at the lower end of the lens's zoom range.)
Extenders are a relatively cheap and convenient way of enhancing your telephoto capability. But using them to increase focal length comes at a cost − reduced maximum aperture. The 1.4x Extender causes a decrease of one stop in the maximum aperture of the lens, while the 2x Extender causes a loss of two stops.
This means you gain extra focal length at the expense of losing some light. If you attach a 1.4x Extender to an EF 70-200mm f2.8L IS III USM lens, for example, it will become in effect a 98-280mm f4 lens. If you use the same lens with a 2x Extender, it becomes a 140-400mm f5.6 lens. In the same way, the EF 70-200mm f4L IS II USM lens has a maximum aperture of f4, but with a 1.4x Extender, the effective maximum aperture becomes f5.6, while with a 2x Extender it becomes f8.
Ideal for press, sports and nature photography, the extender increases the focal length of Canon L-series telephoto or telephoto zoom lens’ by a factor of 2x, with higher AF accuracy and improved communication between camera and lens.
Focal length extension for super-telephoto lenses
The Extender EF 2x III is specially designed to work in conjunction with L-series IS super-telephoto lenses, extending their focal length by a factor of 2x. The extender's design ensures there is no loss of lens performance or image quality.
High-quality construction
Improved anti-reflection materials inside the lens-barrel and a coating around the outer edges of the lens elements reduce flare. Construction is resistant to dust and water, helping to maintain images quality.
Improved communication between lens and camera
A built in microprocessor provides accurate transfer of data from between the lens and camera delivering an improved performance in AF and metering.
Compatible with L-Series telephoto and telephoto zoom lenses
The Extender EF 2x III is compatible with most telephoto and telephoto zoom lenses within Canon’s flagship professional L-series range, extending the focal length by 2 times while only reducing the effective aperture of the lens by two stops.
Note: Only fits on Canon's white tele-photo lenses. AF only possible on f2.8 fixed aperture lenses and faster.
