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Canon 2x RF Extender for RF 600mm f/11 IS STM, RF 800mm f/11 IS STM, RF 100-500mm f/4.5-7.1L IS USM (Can Only Be Used from 300-500mm on Zoom)

Model #384014
  • $589.00

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Canon RF 2x Extender doubles reach on compatible super-telephoto glass

The RF 2x Extender works with a short list of lenses by design: the RF 600mm f/11 IS STM, the RF 800mm f/11 IS STM, and the RF 100-500mm f/4.5-7.1L IS USM in its 300-500mm range. That specificity matters because Canon engineered the communication protocols between these lenses and the extender to maintain autofocus and image stabilization function through the RF mount's high-speed data path. You get genuine 2x magnification, which means the 600mm becomes a 1200mm equivalent and the 800mm stretches to 1600mm, at the cost of 2 stops of exposure.

For shooters already working at f/11 on the fixed-aperture primes, the exposure trade-off lands you at f/22, which means bright light or a high-ISO tolerance is part of the equation. Paired with the 100-500mm L zoom, the 2x extender turns the 500mm end into an effective 1000mm at f/14.2. The reach gains are real, and for a subject that won't come closer, this extender earns its place in the kit bag than a longer lens that costs several times more.

Who It's For

Birders and backyard wildlife photographers shooting the RF 600mm or 800mm f/11 primes get an immediate path to 1200mm or 1600mm without carrying a second lens. Safari and nature photographers using the RF 100-500mm L who need occasional extreme reach beyond 500mm can tap the 2x extender in the zoom's 300-500mm range. Budget-conscious sports photographers already invested in the RF f/11 telephoto lineup gain a practical long-end extension in good light without committing to a larger, heavier prime.

Key Features

  • 2x magnification for genuine focal length doubling
  • Maintains autofocus and image stabilization function
  • Works with RF 600mm, RF 800mm, and RF 100-500mm lenses
  • 2-stop exposure reduction per specification
  • Canon RF mount with high-speed data communication

FAQ

Which Canon RF lenses work with this 2x extender?
The RF 600mm f/11 IS STM, RF 800mm f/11 IS STM, and RF 100-500mm f/4.5-7.1L IS USM (300-500mm range only). Canon built the communication protocols into these specific lenses to maintain autofocus and IS through the extender.
What happens to the aperture when I use the extender?
You lose 2 stops of light. The f/11 fixed primes drop to f/22, and the 100-500mm becomes f/14.2 at its 500mm end. That's the tradeoff for doubling your focal length.
Can I autofocus and use image stabilization with the extender attached?
Yes, both work because the RF mount's high-speed data path handles communication between the lens and extender. This is a key advantage over older teleconverter designs that dropped AF or IS entirely.
What's the actual magnification and reach I'm getting?
A true 2x magnification. Your RF 600mm becomes 1200mm equivalent, the 800mm stretches to 1600mm, and the 100-500mm turns into a 1000mm at its long end. You're not cropping-the entire optical path is magnified.
Is this extender worth carrying instead of buying a longer lens?
If you already own one of these three lenses, yes. A native RF 1200mm or 1600mm lens costs significantly more and adds weight. The extender solves the reach problem for far less money if you can tolerate the f/22 aperture in bright light.
Will the extender work with other RF lenses?
No. Canon engineered the 2x extender specifically for these three lenses. It won't function properly with other RF glass because the communication protocols don't exist on those lenses.
SpecificationValue
MountCanon RF

This description was generated using AI based on KEH's internal product standards, product expertise, and knowing what customers care about most. While we strive for accuracy, details may vary by individual item.

Brand Name Canon
Lens Mount Canon EOS RF