Lens Lab
    Nikon AF-S Teleconverter TC-20E III
    Nikon AF-S Teleconverter TC-20E III

    Nikon AF-S Teleconverter TC-20E III

    Overview

    The Nikon AF-S Teleconverter TC-20E III doubles focal length but reduces aperture by two stops, making autofocus unreliable beyond f/5.6. Optical performance varies by lens: it works well with fast primes like the 200mm f/2 and 300mm f/2.8, yielding good sharpness when stopped down, but degrades image quality and contrast. Build quality is solid, but handling is challenging due to slow AF and need for good light. Best suited for sports and wildlife photographers using f/2.8 or faster lenses who can accept some image compromise.