teleconverter lens
Quick Summary
A teleconverter lens is an accessory that attaches between a camera's prime lens and the camera body. It effectively turns a normal lens into a more compact telephoto system. While this setup is generally less expensive than a dedicated telephoto lens, it does come with trade-offs. Specifically, using a teleconverter reduces the prime lens's effective aperture, often referred to as its "speed," and can also diminish the overall sharpness of the image.1
Telephoto lenses, in general, are designed to make distant objects appear closer, functioning as a telephoto lens for the camera.2
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