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Rent NowSigma APO Teleconverter EX Series (1.4x and 2x)
The Sigma APO Teleconverter EX series is designed to extend the reach of your existing telephoto lenses without the bulk of a larger lens. Available in both 1.4x and 2x magnifications, these dedicated converters utilize high-quality optics to maintain the performance of Sigma’s professional EX and APO lens lines. By increasing the focal length of your master lens, these tools are essential for sports, wildlife, and nature photographers who need extra distance.
Expanded Reach & Magnification
1.4x Teleconverter: Increases the focal length of your master lens by 40% while only reducing the effective aperture by a single f-stop.
2x Teleconverter: Doubles the focal length of your master lens, providing maximum reach for distant subjects, with a reduction of the effective aperture by two f-stops.
Macro Versatility: Both converters increase the reproduction ratio of the master lens (by 1.4x or 2x respectively), allowing for tighter framing and enhanced close-up performance.
Precision Optical Design
APO Performance: Engineered to integrate with Sigma’s apochromatic (APO) lenses, these converters utilize specialized glass elements to minimize chromatic aberration and maintain the resolution and contrast of the original optic.
Aperture Coupling: Both models support an aperture range from f/2.8 to f/32, ensuring full communication between the lens and camera for accurate exposure and data recording.
Seamless Exposure: While the effective aperture decreases (1-stop for 1.4x; 2-stops for 2x), your camera’s metering system continues to determine exposure automatically in the same manner as using the master lens alone.
Compatibility & Safety Notes
Dedicated Use: These are high-performance dedicated converters. They are designed for use only with specific Sigma APO lenses. Please verify compatibility with your specific lens model before use.
Stacking Warning: Do not “stack” these converters (using a 1.4x on top of a 2x) or use them in conjunction with other types of lens converters, as this may cause mechanical interference or severe image degradation.
Usage Professional Tip
For best results, these converters are most effective when paired with fast lenses (f/2.8 or f/4). When using the 2x converter, ensure your camera body supports autofocus at the resulting effective aperture (typically f/5.6 or f/8).
