Average Reviews:
(More customer reviews)This is an exceptional tele-converter for Canon EOS lenses. There are a number of tele-converters out there for current Canon SLR's and lenses (Sigma, Tamron and of-course Canon just to name a few). The Canon converters are only compatible with Çanon L series lenses and will only auto focus with apertures of F4 and larger (for 1.4X) and F2.8 and larger (for 2x). The Kenko PRO 300 has the same aperture limitations (unless some of the pins are taped) however it will work with most Canon lenses. This is definitely a quality PRO product. When used with a high quality lens (I use it pretty much exclusively with my EF70-200f4L) the IQ (image quality) is almost indistinguishable from the lens. In addition focus speed seems just as fast as the lens with out the tele-converter (assuming your lens has an F4 aperture or larger). The general consensus seems to be that the Canon converter is slightly sharper on the edges with the Kenko being equal at the center. For those shooting with a 1.6 crop camera the Kenko should be indistinguishable from the Canon for about a $100.00 less. On the plus side (other then price) the Kenko is more compact and can easily fit in you pocket and can be used with far more lenses (again, the Canon converts can only be used with L series lenses). On the down side, if your using L series lenses, is the color. The Kenko is black while most L series lenses are white (as are the Canon tele-converters). What you get with the Kenko PRO 300 is an excellent tele-converter designed for digital cameras. The elements are special coated to reduce reflections from the image sensor back into the lens. I've yet to notice any chromatic aberration or vignetting. The color and sharpness are as good as the lens you're using.
In summery, this an excellent product. Image quality (especially on a 1.6 crop camera) is about as good as it gets. It's electronic circuitry accurately passes all exif data to the camera. The only reason I give it 4 stars instead of 5 is because the mount between the lens and converter seems to be a little stiff though it has yet to give me problems. On the other hand the mount from the converter to the camera seems to be quite smooth.
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Kenko AF 1.5x Super High Quality Teleplus converter also has genuine Gated Array IC and is compact for light weight and easy handling. Full AF is capable with lenses having a maximum aperture of F/4.5 or brighter. (Manual focusing will be required with lenses of smaller aperture.)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 AF converter has a 3x magnification. For example, using a 2 times (2x) teleconverter will increase the focal of 300mm lens to 600mm. The Teleplus PRO 300 converters are made with high quality multi-coated optical glass supplied by Hoya Corporation, the worlds largest manufacturer of optical glass. These glass elements are 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 is designed specifically to be used with prime telephoto lenses of 100mm or above, such as, a 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.
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