What Does a Teleconverter Lens Do for Your Camera?
By Camera Clix | Published: 2026-10-23
Category: How-to Guides
A teleconverter lens extends your camera's reach by magnifying the image. Learn how it works, its trade-offs, and which lenses pair well with a teleconverter.
Quick Answer
A teleconverter lens is a lens adapter that multiplies your lens's focal length, effectively bringing distant subjects closer. It's a cost-effective way to get more reach without buying a longer, more expensive lens.
How a Teleconverter Affects Image Quality
A teleconverter magnifies the image projected by your lens, which can slightly reduce sharpness and introduce chromatic aberrations. However, high-quality teleconverters, like those with special low dispersion glass, minimize these effects. For example, the Sigma TC-1401 uses an SLD element to keep images sharp and clear.
Compatibility and Limitations
Teleconverters are not universal. They are designed for specific lens mounts and often only work with certain telephoto lenses. Check your lens and camera compatibility before buying. Also, a teleconverter reduces the maximum aperture by the magnification factor (e.g., 1.4x reduces aperture by one stop), which can affect autofocus performance in low light.
Teleconverter FAQ
- How much reach does a teleconverter add?
- A 1.4x teleconverter multiplies your lens's focal length by 1.4. For example, a 200mm lens becomes 280mm. A 2x teleconverter doubles it to 400mm.
- Will a teleconverter work with any lens?
- No. Teleconverters are designed for specific mounts and often only work with certain lenses, usually telephoto primes and zooms. Always check compatibility lists from the manufacturer. Before purchasing, verify that your lens and camera body are compatible with the teleconverter.
- Does a teleconverter affect autofocus?
- Yes, because it reduces the maximum aperture. A 1.4x teleconverter costs one stop of light, which can slow autofocus, especially in low light. Some cameras may struggle to autofocus with a 2x teleconverter on slower lenses. If you shoot in low light often, consider a lens with a wider maximum aperture or a 1.4x teleconverter instead of a 2x.
- What is the difference between a teleconverter and an extension tube?
- A teleconverter magnifies the image to increase reach, while an extension tube moves the lens farther from the sensor to allow closer focusing for macro photography. They serve different purposes.
Teleconverter Options to Consider
- Sony 1.4x Teleconverter Lens: This Sony 1.4x teleconverter is designed to extend the reach of compatible lenses while preserving full G Master performance. If you own Sony E-mount telephoto lenses, this adapter lets you get closer to action without sacrificing the lens's renowned quality.
Sony 1.4x Teleconverter Lens - Sigma TC-1401 1.4X Teleconverter Lens - Canon: The Sigma TC-1401 1.4X teleconverter for Canon includes an SLD glass element to minimize chromatic aberrations and distortions. It's a budget-friendly way to add reach to Canon telephoto lenses while maintaining sharp, color-accurate images.
Sigma TC-1401 1.4X Teleconverter Lens - Canon
