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Specification

Source of data

• Manufacturer's technical data.

Manufacturer description #1

The Kenko Teleplus PRO 300 DG teleconverters are designed to perform the best when used with longer telephoto lenses. Recommended to be used with lenses longer than 100mm, they will maintain the resolution of the prime lens even at the corners.

Kenko PRO 300 DG AF Teleplus converters have genuine Gate Array IC. It means that the converter's own unique circuitry maintains signal integrity between the camera body and lens. The PRO 300 DG 3.0x teleconverter has a light loss equivalent to 3 stops. Manual focusing may be required with lenses having a smaller than f/2.8 aperture or with low-contrast or low-light subjects.

Manufacturer description #2

Placed between the camera body and lens, a teleconverter contains a set of optics that will effectively increase the focal length of a lens by a specific amount. Common magnifications are 1.4 times and 2 times, but the Kenko Teleplus PRO 300 DG AF converter has a 3x magnification. For example, using a 3 times (3x) teleconverter will increase the focal of 300mm lens to 900mm.

The Teleplus PRO 300 converter is made with high quality multicoated optical glass supplied by Hoya Corporation, the world's largest manufacturer of optical glass. The DG model is optimized for use with digital SLR cameras, as well as film cameras.

The PRO 300 3x is designed for use with lenses of 50mm or above and work best with telephoto lenses of 100mm to 500mm. The PRO 300 3.0x can be used with telephoto zoom lenses as well as prime lenses. However, Kenko does not recommend them for lenses that have a zoom range that starts under 50 mm.

KENKO PRO 300 DG AF Teleplus converters have genuine Gate Array IC (Integrated Circuit). This means that the converter's unique circuitry maintainS signal integrity between the camera body and lens. These converters are designed to electronically operate the same way an original manufacturer's converter would provided there is enough light available.

Important Note: Due to the 3 stop light loss inherent in a 3x converter, Kenko states that the PRO 300 3.0x converter will not auto focus with lenses that have a smaller aperture than f/2.8. With all lenses having apertures smaller than f/2.8, Kenko recommends using the PRO 300 3x in manual focus mode.