The Kenko PRO 300 1.4X features Magnification 1.4x, Exposure magnification: approx. 2x and The lens construction has 7 elements in 4 groups. The Kenko PRO 300 1.4X lens weighs 4.7 oz (132 g) and it measures has 1.1″ (27mm) long.
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Kenko PRO 300 1.4X User Reviews
This is an exceptional teleconverter for Canon EOS 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).” – by Paul Kurtz
Very high quality
“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.” – by Jim Krupnik
Kenko has surprised me with quality
“I have been pleasantly surprised by the image quality of this Kenko extender. Many years ago when I tried extenders they were horrible. I read many reviewers being happy with this extender and I thought I’d try this one as I wanted to be able to use it on lenses that the Canon extender would not work on. With my Canon 300mm F4 it also helps with close focus- almost macro work! I would recommend it without hesitation as long as you can live with the one stop loss. “ – by P. Rentz
Pretty good product
“I am more into wildlife and sports photography, and have been using the 100-400 for quite sometime now, mainly coz of its versatility. But there were many a times, when i wanted that extra reach. For this, I got Kenko q.4x pro 300 DG. Obviously, the main factor being the price, but also the reviews i read about it. Considering that the light is good, say you can shoot at a min of 1/500 shutter speed, at f/15, this TC gives great images. The autofocus is a little slow, but then, thats how it was supposed to be.” – by Ismail Shariff
An Excellent Professional Teleconverter
“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).” – by Noel Cuta
Very nice…works on ALL of my Canon EF lenses
“On my 5DMKII, my 70-300mm DO lens became a 100-420mm (and you must take a look at the DO to understand, it’s an incredibly small package to be able to carry 400mm around, and then you can take off the 1.4x and drop back do 70mm again for a slightly wider angle – Perfect for when you only can bring one lens on the road and don’t want to carry a GIANT white with you). The DO’s image quality is a tad above average, so I would never use it professionally. However it’s a fantastic lens when you look at it’s portability and FANTASTIC Image Stabilization.” – by Topher
Kenko PRO 300 1.4X Sample Photos
Kenko PRO 300 1.4X User Manual
Kenko PRO 300 1.4X Specifications
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.