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.
The Kenko PRO 300 AF 1.4X DGX is commonly used for Landscape/scenery, Wildlife photos and more.The Kenko PRO 300 AF 1.4X DGX is most used by customers who consider themselves to be a Photo enthusiast among others.The Kenko PRO 300 AF 1.4X DGX is popular because customers like the following qualities of the Kenko PRO 300 AF 1.4X DGX: Consistent output, Durable, Easily interchangeable, Fast / accurate auto-focus, Lightweight and Strong construction
Most Liked Positive Review
Improves Resolution On Sigma 120-400
Purchased this from Adorama to use with Sigma 120-400 /4.5-5.6 Apo HSM, also purchased from Adorama. Wasn't expecting what I have observed in static (tripod, remote shutter release)tests with my Canon 40D. With Sigma set to approximately 285mm x 1.4 mag factor = 399mm, the resolved detail on brick surfaces or Hardy Plank wall board textured surface (15 feet distance) is decernably better in an unadjusted RAW file than then equivalent prime lens magnification at 400mm without the Kenko in the ...View full Review
Purchased this from Adorama to use with Sigma 120-400 /4.5-5.6 Apo HSM, also purchased from Adorama. Wasn't expecting what I have observed in static (tripod, remote shutter release)tests with my Canon 40D. With Sigma set to approximately 285mm x 1.4 mag factor = 399mm, the resolved detail on brick surfaces or Hardy Plank wall board textured surface (15 feet distance) is decernably better in an unadjusted RAW file than then equivalent prime lens magnification at 400mm without the Kenko in the light path. Similar findings were seen at distances shorter than 285mm + Kenko 1.4 C-AF/Pro300 DGX and their equivalent prime lens distance. The Kenko retains the autofocus capabilties on the Sigma lens while Sigma indicates their 1.4 adapter does not supported autofocus on this lens. Using the AV setting on the 40D, the prime lense exposure images appeared slight darker - F5.6, 1/120 sec than similar exposures with the Kenko in the light path - F8.0, 1/64 (approximately 1/3 EV measure by 40D metering system). Over-all - excellent investment if you've got a Sigma 120-400mm and wishing a little more magnification.
Reviewed by 13 customers
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.
I use this T.C. with several Canon lenses and it just works! AF is fast and accurate. Picture quality is excellent while using this T.C.! Another advantage is the T.C. reports all information to the camera body, so one knows all photo specific details. I like to know my focal distance when I review my photos. One thing I would like Kenko to include is: maybe there can be an asterisk somewhere on the file, so one knows when a T.C. was used, but not at max focal length. Maybe it's an Adobe or Apple issue? If an identifier already exists, then disregard my comment. It's my ignorance for not figuring it out!
You loose one stop of course but autofocus still works up till f:8 if there is sufficient light. Good glass, accurate fitting