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Rent NowCanon EF 1.4x II Extender (Teleconverter)
The Canon EF 1.4x II Extender is a high-quality, professional-grade teleconverter designed explicitly for select Canon EF-mount L-series telephoto and super-telephoto lenses. By magnifying the incoming optical image by 1.4x, this precision extender allows sports, wildlife, and photojournalists to instantly stretch their focal reach without carrying the bulk or incurring the cost of an entirely separate super-telephoto lens. Built to meet rigorous L-series standards, it preserves the native resolving power, color accuracy, and contrast of your primary lens while offering heavy-duty weather protection in the field.
CONDITION NOTE
Cap Configuration Alert: This extender is fully tested and optically clean, but is missing one of its standard protective caps (either the front or rear cap). It will be packed securely for transit to ensure the exposed glass element remains completely shielded and safe.
1.4x Focal Multiplication & Optical Coatings
1.4x Reach Extension: Instantly multiplies the focal length of a compatible prime or zoom lens by 1.4x. For example, mounting this extender onto an EF 300mm f/2.8L lens transforms it into an effective 420mm f/4 setup.
1-Stop Light Reduction: Due to the physical laws of optics, utilizing a 1.4x teleconverter reduces the maximum light transmission by exactly one f-stop (e.g., an f/2.8 lens becomes an f/4, and an f/4 lens becomes an f/5.6).
Advanced Anti-Reflective Internal Coatings: Features re-engineered internal barrel and element coatings that optimize light transmissivity. This specialized treatment aggressively reduces internal reflections, flare, and ghosting when tracking subjects in backlit or strong side-lit conditions.
Telephoto Optimization: Explicitly engineered for long telephoto focal lengths. Teleconverters are not recommended for wide-angle or standard mid-range zoom lenses (such as a 28-105mm) where physical rear-element collision or heavy optical degradation would occur.
Weather-Sealed Construction & Camera Interactions
Pro-Tier Weather Extremes Sealing: Built with professional-grade rubber gasket seals at the mechanical mounting joints. When sandwiched between a weather-resistant EOS camera body and an IS super-telephoto lens, the entire imaging chain achieves near-imperviousness to rain, dust, and moisture.
Autofocus Functionality Matrix:
f/4 or Faster Lenses: Full autofocus tracking is supported on all Canon EOS digital and film SLR camera bodies when paired with a primary lens featuring a native maximum aperture of f/4 or faster.
Center-Point AF Constraints: On select camera systems or slower lens configurations (such as an f/4 lens becoming an f/5.6, or an f/5.6 lens becoming an f/8), the camera’s autofocus framework will automatically restrict operation to the ultra-precise center autofocus point only to maintain focus speed and prevent hunting.
Dedicated Lens Tracking Specifics:
EF 180mm f/3.5L Macro USM: When paired with this macro lens, the active autofocus range is governed from 2.6 feet (0.8 meters) out to infinity.
EF 100-400mm f/4.5-5.6L IS USM Legacy Notice: Hardware optical stabilization (IS) is fully compatible with modern digital EOS bodies, but will not engage when used on legacy 1980s/1990s film bodies (such as the original Rebel, Elan, 600-series, or A2).
Technical Specifications
Focal Length Multiplication: 1.4x
Light Loss: 1.0 Stop
Lens Mount Type: Canon EF (Strictly L-Series Telephoto Compatible)
Lens Construction: 5 Elements in 4 Groups
Physical Dimensions: Approx. 2.9 x 1.1″ (72.8 x 27.2 mm)
Weight: Approx. 7.8 oz (220 grams)
