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Kenko TELEPLUS PRO 300 1.4X DGX Teleconverter for Canon EOS Digital SLRs
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- Make sure this fits by entering your model number.
- With the PRO 300 1.4x, DGX full AF operation is possible with camera lenses having a maximum aperture of F4 or brighter.
- The PRO 300 can be used with telephoto zoom lenses as well as prime lenses.
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|Sold By||Ace Photo||TheCameraBox||hanamizuki japanstore||Adorama||6ave||Vistajapan|
|Compatible Camera Mount||Canon EOS||—||Nikon (DX), Nikon F(DX)||Canon EF||Canon EF, Canon EF||Canon EF, Canon EF|
|Focus Type||Autofocus||Manual Focus||Autofocus||Autofocus||Autofocus||Autofocus|
|Item Dimensions||0.39 x 0.39 x 0.39 inches||0.98 x 2.60 x 2.60 inches||0.39 x 0.39 x 0.39 inches||1.06 x 2.83 x 2.83 inches||2.76 x 2.76 x 1.00 inches||0.79 x 2.72 x 2.72 inches|
|Item Weight||0.04 ounces||3.92 ounces||0.04 ounces||7.83 ounces||6.70 ounces||5.04 ounces|
|Maximum Aperture||4.5||1 millimeters||0 millimeters||1.4||0 millimeters||2.8|
|Maximum Focal Length||0||1 millimeters||0||1 millimeters||0 millimeters||420 millimeters|
|Minimum Aperture||0 millimeters||1||0 millimeters||22||0||0 millimeters|
|Minimum Focal Length||0||1||0||1 millimeters||0 millimeters||70 millimeters|
With the Kenko Teleplus PRO 300 DGX 1.4x AF Teleconverter full autofocus (AF) functioning is possible with lenses having a maximum aperture of f/4 or brighter. Having 1.4x magnification, the Teleplus PRO 300 is constructed of 5 multi-coated elements in 4 groups and allows a depth of field 1/1.4 of the prime lens used and retains the prime's minimum focusing distance. The Teleplus PRO 300 has genuine Gate Array IC, which means that not only the converter's own data but all data sent from the camera body provide full exposure metering and electronic flash photography.
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Optically, it is as good as one could expect from a teleconverter. Yes, color fringing, most visible in high contrast transitions, will increase. This is expected as no converter will correct flaws of the lens, only enhance them. There is also more softness for the edges of the image. Center sharpness is pretty decent. From a few test shots with 300mm and 400mm lenses, I would say that half the time I got a bit better resolution compared to the base focal length and half the time the somewhat softer image quality ate up the difference. Light condition played a big role here (shooting against light would always result in washed out detail). Auto-focus worked well, at least for any lenses F4.0 or faster. On my 400mm F5.6 L lens, auto focus was a mixed back with the Canon 70D. Center focus point would work for high contrast areas, but not so much at other times. But still pretty good as it makes it a F8.0 lens. I also got better results using the automatic AF selection. The converter adds a slight yellow tinge to the image, but I found this to be OK. In direct comparison using the 400mm F5.6 L against my Sigma 100-300mm F4 with the converter, I found the out-of-focus blur from the Sigma/Kenko combo to be a bit less nervous. Sharpness wise, those two were pretty close, with a slight edge to the Canon, especially in the image borders.
So why only 3 stars? That is due to lens/camera compatibility. One lens I wanted to use the converter for is the Canon 200mm F2.8L II. However, the camera (both a 70D and a 6D) locked up with that lens and the Kenko. I would have to pull and reinsert battery to get the camera working again. Same happens with the Canon 135mm F2.0L. Here a summary of lenses tested:
Canon 100mm F2.8 Macro USM - Works, good auto focus
Canon 24-105mm F4.0 L - Works, good auto focus
Canon 135mm F2.0 L - Locks up camera
Canon 200mm F2.8 L II - Locks up camera
Canon 400mm F5.6 L - Works, mixed auto focus
Sigma EX 100-300mm F4.0 - Works, good auto focus
Since the two lenses I wanted to use with this TC the most are Sigma lenses (the 70-200 f2.8 EX DG OS HSM and the 150-500 f5-6.3 APO DG OS HSM), I first purchased the Sigma 1.4X EX APO DG teleconverter. I had that TC for two days, and found the loss of sharpness to be unacceptable. Since I'd bought that from Amazon, I was able to return it.
On one of my flickr groups, I came across a few stunning images taken with the same 150-500 lens as I have, and this Kenko 1.4x TX. I decided to give it a try, and so I bought it (again, from Amazon).
So far, I've taken about 400 pictures with this TC, using not only my two Sigma lenses, but also my Canon 70-300 f4-5.6L. And a couple hundred more using my wife's 60D. So far, I'm very impressed at how well it works. I'm sure that there probably IS some loss of IQ, but it's very small. Much much less than the Sigma TC, and certainly not enough to tell until you start looking at 100% crops. I got a picture of one of my beagles with my big Sigma lens and this TC, and it's probably the sharpest picture I've taken to date with that lens. And while the Sigma TC didn't work on the Canon 70-300L lens, this Kenko didn't have any problems at all.
Autofocus works OK with this TC, both on my 5Kmkiii and on my wife's 60D. It does focus a little slower than without the TC, and sometimes it hunts a bit in low light...but you knew that going in! My camera correctly adds an f-stop, and correctly reports the total effective FL (lens length X 1.4) in the exif data.
Bottom line, I'm happy with this purchase. If I lost this TC, I'd buy another one.
To settle the issue, our most rigorous comparison test was on a Canon 200mm f2.8 lens and a 6D camera. The lens was firmly secured to a heavy tripod. Each test photo' focused identically. Mirror locked up, and cable release used. Basically, everything identical and optimized for maximum performance: the only relevant difference being the 1.4x teleconverter between lens and camera body.
In pursuit of objectivity, I removed the EXIF info, and passed the files to a 3rd party. The 3rd party showed the photos to another amateur photographer, who was asked to distinguish which photo' was taken through the Canon TC Extender EF 1.4x III? and which is taken through the Kenko 1.4X PRO 300 Teleconverter DGX?
After careful side by side comparison at high magnification, the test subject hesitantly picked one as taken through the Canon. His reason was that he noticed a very slight diference in the corner of the image. But he was quick to say that they were both very sharp. I later asked him how sure he was of himself, and said 50.1% sure. Basically he got it right, but wasn't sure enough to bet on it.
This is consistent with my interpretation of the above test. At high magnification, the center appeared only very slightly sharper with the kenko. On the other hand, the extreme corners appeared just barely sharper with the Canon. Basically, in this demanding situation they appeared to be practically identical in optical performance.
Additionally the Kenko 1.4X TC is more compact and discrete than the Canon version.
In summary, the Kenko 1.4X PRO 300 Teleconverter DGX is VERY competitive with Canon TC Canon Extender EF 1.4x III.
Top international reviews
It was mainly for use with a Canon EOS M3 Camera with which it gives greater range with no noticeable drop off of picture quality but I also used in on the full frame Canon 6D with similar results but because it is full frame there is a drop of in range , although not by a lot .
I would recommend the Kenko 1.4 to any any one .
It would have been helpful if the fact that this convertor does not fit EOS Digital Rebel EF-S lenses was included within the online product description.
The Instructions within the box mention -
"EFS lens, exclusively to EOS Digital Rebel, is not applicable for TELEPLUS DGX because of the shape of the lens".
But it makes my 200mm lens go to 280mm. A good advantage in some situations.
The build quality is ok. Not Canon but ok for the price
Canon does not want you to use third party gear' item returned.