Kenko 2X Teleplus PRO 300 AF

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image of Kenko 2X Teleplus PRO 300 AF

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(From company literature) Kenko Teleplus Pro 300 converters are made with precision quality multicoated optical glass supplied by Hoya Corporation, the world's largest manufacturer of optical glass. These glass elements were designed to match the optical quality of the prime lens (even at the edges) and telephoto zoom lenses. The optical design of the elements and light path is wide enough not to cause vignetting.

The PRO 300 family are designed specifically to be used with prime telephoto lenses of 100mm or above, such as the Tokina AT-X 300 AF PRO, 300 mm f/2.8 lens, and work best with telephoto lenses of 200mm to 500mm. The PRO 300 can be used with telephoto zoom lenses as well as prime lenses. However, Kenko does not recommend them for zoom lenses that have a range starting under 50 mm.

KENKO PRO 300 AF Teleplus converters have genuine Gate Array IC (Integrated Circuit). This means that the converter's own unique circuitry maintains signal integrity between the camera body and lens. These converters are designed to electronically operate the same way as an original manufacturer's converter.

Full AF operation with PRO 300 2.0x is possible when using camera lenses with maximum aperture of f/2.8 or brighter. Please be aware that AF will work properly only if there is enough light and contrast on the subject to activate the camera's AF sensors (manual focusing is required when using lenses with smaller maximum f-stop value than those given above).

Kenko 2X Teleplus PRO 300 AF

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Kenko 2X Teleplus PRO 300 AF User Reviews

6.0/10 average of 1 reviews Build Quality 8.0/10 Image Quality 3.0/10
  • 6 out of 10 points and recommended by (15 reviews)
    soft results

    That's the only x2 TC I've ever used and will probably be the last one as well.
    Image quality on both my Nikkor 80-200/2.8 and Sigma 105/2.8 macro suffered significantly and the resulting images were too soft for my liking.
    Note that I used the proper technique with a sturdy tripod and remote release (no MLU on my Nikon D70).
    Compatibility is another story - unlike Nikon Tcs, this one will work with whatever lens you throw at it.
    Though it's made of plastic, the build quality is fine for what it's required to do.
    Note that there are no weather seals on this TC.

    Bottom line:
    It's very tempting to get twice the reach of your existing lenses, but the resulting IQ isn't worth the gains.

    reviewed November 17th, 2006