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. 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.
Most Liked Positive Review
Solid, clear teleconverter
You loose one stop of course but autofocus still works up till f:8 if there is sufficient light. Good glass, accurate fitting
Reviewed by 15 customers
This converter works perfectly with my Nikon equipment, including a variety of lenses. Image quality is first rate and the auto focus is exceptional, especially with prime lenses.
The quality of the pictures has more to do with the lens you mount this on. I use it on a Canon ef 70-200 f/4 with very good to excellent results. The limiting factor is in obtaining precise focus as the depth of field is reduced with higher focal length. Also on the Canon 85 f/1.8 at f/2.8 with great sharpness. There is some color fringing on the 85mm but that is characteristic of the lens not the converter. The connection between lens and converter is not lock tight, but presents no meaningful problem. There is very little to complain about with this product. It just works well.
I am still comparing images with this teleconverter. One thing is for sure, it saves money on buying even more expensive glass. I use this TC with my 70-300L, and so far, the images have been acceptable. My 420mm shots are not as clean as my 300mm shots, but I have 120mm more reach than I had before.
Use it with my 100-400L. It does not seem to degrade the image at all. It does cause my 7D to hunt with the lens unless there is high contrast and lots of it. Lots of light is needed also to get AF. BIF do not seem possible.
After dealing with Nikon tech support (equivalent to no support) I bought a Nikon teleconverter which was incompatible with my lenses. This was after spending much time with Nikon tech & having them tell me that the lenses were compatible. I sent the Nikon back & bought the Kenko which solved my problems, is a quality product and is easy to use. I recommend it.
I use it with a Canon 70-300. It does the job.
Well, it's my first teleconverter, so can't compare, but it works great.
Gives me that extra reach with very little degradation in image quality.
I use this mostly with my 90mm Macro and it kicks it out to 126mm for closer shots. Easy to carry and works great. Very happy.
Used with Canon 7D, Canon EF 70-300mm f/4-5.6 IS USM. With typical landscapes and good light, the Kenko TC performs very well, focusing quickly with good accuracy. I noted some softening at the extremes, but that was expected and somewhat correctable in software. Much better than expected performance shooting macro from 5 1/2'. Birds in flight presented a much larger challenge and performance here was inconsistent with focus often too slow to capture subjects accurately. Overall, a useful addition to the bag for Canon shooters wishing to extend their range a bit without taking out a second mortgage for "L" lenses and the pricey Canon TC that only works on "L" lenses. The Kenko TC will NOT work on EF-S lenses and in some situations, count on focusing manually for best results.