KENKO Teleplus Pro 300 DGX converters are made with precision quality multi-coated optical glass supplied by Hoya Corporation, the worlds 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 300 mm f/2.8 lenses, 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 Circuitry). It 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 DGX is possible when using camera lenses with maximum aperture of F2.8 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.)
With the PRO 300 1.4x, DGX full AF operation is possible with camera lenses having a maximum aperture of F4 or brighter. The same light and contrast requirements apply.
The DGX Teleplus converters have updated circuitry to record exif data more accurately. In the exif exposure data (meta-data recorded with a digital picture) DGX converters record the equivalent aperture and focal length of the lens setting plus tele-converter. Optically and mechanically they are the identical to the prior high-quality DG series converters.
Construction E/G 7 Elements in 4 Groups / 5 Elements in 4 Groups
Coatings Digital Multi-Coating
Depth of Field 1/2 & 1/1.4 of prime lens
Exposure Magnification Approx 4 times (equivalent to 2 diaphragm) / Approx 2 times (equivalent to 1 diaphragm)
Diaphragm Coupling Fully Automatic
Barrel Length 1.1 in (27.00mm)
Weight 6.5 oz (184/132g)
Mounts Canon-EOS*, Nikon-AF
Notes *Canon EF-S lenses are not applicable. NOTE: The Kenko DGX TelePlus converters are not compatible with the Canon Digital Rebel XT / Rebel 350D camera body and will not function on them. All other Canon DSLR cameras bodies work with Kenko DGX converters.
**** Kenko DGX Teleplus conversion lenses are compatible with only genuine lenses (Nikon and Canon) and Tokina lenses (except Tokina AT-X 70-200mm F4 PRO FX VCM-S)
Warranty 1 Year Limited Warranty
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