Nikon AF-S TC-20E III review: double your reach without blowing the bank

The Nikon AF-S TC-20E III is designed to double the reach of compatible F-mount telephoto lenses with minimum impact on performance.

Nikon AF-S TC-20E III
(Image: © Matthew Richards)

Digital Camera World Verdict

The Nikon AF-S TC-20E III was something of a groundbreaking teleconverter when it was launched and, for my money, it’s still one of the best on the market. I find the 2x magnification in telephoto reach really covers the distance.


  • +

    Twice the telephoto reach

  • +

    Conveniently compact

  • +

    Robust, weather-sealed build


  • -

    2 f/stops aperture reduction

  • -

    Slight impact on lens performance

  • -

    Incompatible with non ‘AF-S’ lenses

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It’s highly unlikely that Nikon will ever make another F-mount teleconverter, so this 2.0x version is probably the last in the line for Nikon cameras with compatible F-mount Nikon telephoto lenses. Unlike the newer Z-system teleconverters, it’s primarily designed for DSLRs but can also be used on Z-mount mirrorless cameras via an FTZ or FTZ II mount adapter. And it remains one of the best teleconverters on the market. As a 2x teleconverter, it doubles the focal length of the attached lens, with a reduction of 2 f/stops, so a Nikon AF-S 70-200mm f/2.8E FL ED VR lens effectively becomes a 140-400mm f/5.6 super-telephoto zoom.

The distinctive gray cap covers the protruding part of the optical layout. (Image credit: Matthew Richards)
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MountNikon F
Lens construction7 elements in 5 groups
Focal length multiplier2.0x that of main lens
Aperture reduction2 f/stops
Minimum focus distanceSame as main lens
Maximum magnification2.0x that of main lens
Dimensions66 x 48mm
Nikon AF-S TC-14E III

The Nikon AF-S TC-14E III gives a lesser 1.4x rather than 2x magnification 4x, but it’s only an inch thick and 190g, and you only lose one f/stop in aperture instead of two.

Nikon Z Teleconverter TC-2.0x

Got a Nikon Z-system camera? The Nikon Z Teleconverter TC-2.0x is the native equivalent for mirrorless camera bodies and compatible Z-mount telephoto lenses.

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Matthew Richards

Matthew Richards is a photographer and journalist who has spent years using and reviewing all manner of photo gear. He is Digital Camera World's principal lens reviewer – and has tested more primes and zooms than most people have had hot dinners! 

His expertise with equipment doesn’t end there, though. He is also an encyclopedia  when it comes to all manner of cameras, camera holsters and bags, flashguns, tripods and heads, printers, papers and inks, and just about anything imaging-related. 

In an earlier life he was a broadcast engineer at the BBC, as well as a former editor of PC Guide.