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Kenko 1.4X PRO 300 TeleconverterDG-Canon EOS

4.0 out of 5 stars 11 customer reviews

Price: $228.38 & FREE Shipping
Only 1 left in stock.
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$228.38 & FREE Shipping Only 1 left in stock. Ships from and sold by PORTABLE GUY.

Technical Details


Product Description

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.

Product Information

Product Dimensions 3.5 x 3.1 x 2.8 inches
Item Weight 4.6 ounces
Shipping Weight 7 ounces (View shipping rates and policies)
ASIN B000KZ5ZZA
Item model number K1.4PRO.300DG-C
Customer Reviews
4.0 out of 5 stars 11 customer reviews

4.0 out of 5 stars
Best Sellers Rank #4,800 in Camera & Photo > Lenses > Camera Lenses
Date first available at Amazon.com March 25, 2008

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Customer Reviews

Top Customer Reviews

By Paul Kurtz on February 11, 2007
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.
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Verified Purchase
I own both Canon extenders, and bought the Kenko 1.4 extender to see how it would work on lenses that the Canon extenders do not fit. The primary lens was the EF 70-300 DO IS lens. The Canon extenders just don't fit it.

The Kenko fit just fine, and performed very well. It is a very high quality optic, and I have no issues with it at all. Mounted on the 70-300 DO IS lens, it transformed it into a 98-420 mm lens with a max aperture of f/8 at the long end. Mounted on both of my 30D bodies, AF was fully functional at every focal length. That was a bonus that I expected to have to live without, as AF can be spotty at best at f/8.

It works fine, and the captured images are very fine. I like this TC. I also tested it against my Canon 1.4 extender on my EF 70-200 f/2.8 IS L lens, and found little to choose from between the two. They can also be stacked on the 70-200 f/2.8 lens (not all lenses, as the stack will only work if the Canon extender fits to the lens, and the Kenko fits to the body), and the image quality is as good as the Canon 2x extender by itself. You can see many possibilities here....

The Kenko is very well built, but it isn't really cheap. It is on par with the Canon in performance, and fits more Canon lenses than the Canon extender, but only the Canon extenders are weather resistant. They incorporate an O ring that seals to 1D series bodies, and to weatherproof L lenses. If that isn't an issue for you, the Kenko is a great product.

I'll buy another similar Kenlo product without hesitation. By the way, the Kenko and the Tamron extenders are identical except for branding. As best as I can tell, they are both built by Hoya/Kenko, so I went with the Kenko brand. I have handled both though, and they are the same product.
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This Kenko Teleplus PRO 300 DG AF 1.4x Teleconverter works well with my Canon EOS 40D with Auto Focus/Manual Focus of the following lenses: Canon EF 70-300mm f4.0-5.6 IS USM, EF 70-200mm f2.8 IS USM, Canon EF 28-135mm f3.5-5.6 IS USM, and Tamron 28-75mm f2.8. It is well-built and it is on par with Canon 1.4 extender in performance. Given with enough light source, you can get better and sharper images for Canon EF 70-300mm f4.0-5.6 and 28-135mm f3.5-5.6 (at f/11-f/16) and EF 70-200mm f2.8 IS USM and Tamron 28-75mm f2.8 (at f5.6-f/8). I have not tried this TC with lenses above 300mm focal length.

On the other, the problem that I have using this Kenko Teleplus PRO 300 DG AF 1.4x Teleconverter is that the camera cannot register automatically in the EXIF data the correct focal length and aperture setting of the aforementioned lenses. However, it is understood that using such TC 1.4x like this a one f/stop loss and 1.4x increase in focal length of the lens being used are expected. But on the other after manually adjusting the aperture setting which is required to get sharper images, the camera can identify now and register the adjusted aperture setting as reflected in the later EXIF data. This is only a minor problem which has nothing to do with image quality of our taken pictures and which can be ignored.

As of the moment, I am happy with this Kenko Teleplus PRO 300 DG AF 1.4x Teleconverter which is giving me an added range for my lenses without suffering the loss of image quality of my pictures.

I highly recommend this TC for your added range.
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