Kenko2.0X PRO 300 Teleconverter DGX for NIKON AF Digital SLRs

We all can read about the three main challenges, loss of sharpness, loss of two stops of aperture, BUT... for me anyway, with a 70-300mm L IS lens and on a good solid carbon-fiber tripod using a Wimberly head I think I can say that the results are good for wildlife, birds that are within 100 feet or so. Anything beyond that range just necessitates buying a full high quality lens or renting one IF you want the quality that paying a premium brings. I think I can say that this converter will make subjects sharper than simply cropping a normal image 2x on the computer. For this reason, I'll keep this one and use it to its best advantage. If you're shooting architectural subjects, the quality 'looks' way better than the nature shots and I can only explain that by saying on birds I want to see detail in the feathers, on buildings, eh, it's a little less demanding so it 'looks' better. Also, a plus, the AF works even at my 70-300mm zoomed out to 300mm which means the 5.6 is down to f/11 yet the AF still works and pretty good too. I fiddled with both manual and AF and of course both are an option. The optics I feel are every bit as good as Canon's 2x II and III converters, with many advantages like: this converter fits certain lenses where the Canon III will not fit my 70-300 L zoom. The AF works below f/8, which is better than the Canon TC's. I like this converter a lot and am pleased to have both this and the Kenko 1.4 converter in my arsenal whereas I've sold my Canon converters as they were too limiting.

I do mostly wildlife photography so I want as much reach as possible. A 2 x teleconverter is somewhat of an over-reach anyway you want to look at it. Canon's is really expensive and had fewer problems but does have some still. Kenko is probably a third tier lens manufacturer but for the price, I'd try it. Auto-focus is not possible even though the electrical connections are there, it does not do a very good job. I have to go to live view and use my Lens Hood viewer to manually focus. Tripod is a must and remote shutter control is preferred. I don't use it much as it is fussy and difficult to get really sharp focus and exposure. I'm going to rent a Sigma and Canon 1.4 x and try them out before I purchase another teleconverter. I gave this 3 stars, even though it did not meet my expectations because I don't think any 2 x would have.

I've been hesitant to buy a teleconverter for my Canon 100-400L f/4.5-5.6 lens after reading so many reviews about the Canon version losing auto-focus with such narrow apertures. The reasons given by the experts is that the camera cannot auto-focus on apertures above 5.6 because not enough light can enter the lens to allow the autofocus to work. Adding a 2X teleconverter effectively narrows the aperture by two whole stops, so a lens that is already 5.6 at its widest setting becomes effectively f/11, which cannot autofocus. This didn't make any sense to me because I shoot on my Canon 5D Mark II at f/11 all the time without any auto-focus issues, assuming I have enough light. Then I read in some forums where people could place tape over one of the contacts on the Canon teleconverter which would allow focus, which leaves me to think that Canon intentionally designed their teleconverter to stop autofocus on lenses f/5.6 or higher, even in cases where there may otherwise be enough light. That is very frustrating to me because I think the photographer should decide whether or not to use autofocus. If you find there is not enough light and the autofocus is "hunting" too much, switch to manual and move on, otherwise, if there is enough light to autofocus, you should be able to make the choice.So I read other reviews that said not only does this Kenko teleconverter NOT have the intentional auto-focus limitation, but people have said it is every bit as sharp as the Canon version, at half the price. That was enough for me to make the choice to purchase this product. Since I don't own the Canon version, I can't compare image quality, but I can say this. When I fully extend my lens to 400mm f/5.6, making an effective 800mm f/11 lens, the images (handheld, image stabilized) are every bit as sharp as without the converter. I tried this outside, on an overcast day, with ISO 800 and the autofocus works perfectly. On a brighter day, I can probably dial down the ISO and still get good results. I'll post some pictures soon to show just how sharp this teleconverter is. I can't imagine getting better results with the Canon version.Please bear in mind that this review is based on use with a Canon 5D, which is known for its low-light capabilities. It is possible that with crop-sensor cameras, the auto-focus will require more light.I did have to knock off one star because I found the connection to be a little too tight and I can feel the metal scraping as I twisted it in place. I was very nervous that I was going to damage my camera or lens, or get it stuck, as one reviewer complained about. Thankfully this did not happen and I can add and remove it without problem, but I think the manufacturing tolerances need to be a little bit better. Other than this, the product seems solid and well built.

Great product, does exactly what I need it to do.

rapport qualité prix ok, bon achat

Funciona mejor de lo que esperaba, las fotos no pierden tanta calidad como pensaba, y el autofocus funciona relativamente bien.

Materiales correctos y compatible con objetivos Nikon con AF mecánico. Los originales de Nikon sólo funcionan con los AF-S y son mucho más caros.Funciona bien montado en un Nikon AF 300mm f/4. El modelo DGX 1.4X conserva mejor la nitidez y el DGX 2X disparando con la cámara en trípode u otro soporte estable es útil para sujetos más lejanos.El diseño óptico de 7 elementos es distinto del antiguo MC7, supongo que para adaptarlo a las cámaras digitales. El DGX escribe en los datos exif la focal equivalente total, cosa que el antiguo MC7 no hace. Con el 300mm f/4 el exif marca 600mm f/8 equiv.En el zoom Nikon AF-S 70-300 VR le cuesta mucho llegar a enfocar, con el zoom en 300mm el diafragma de f/5.6 queda en f/11 y le falta luz.

Spedizone, tempi di consegna e imballaggio impeccabili.Acquistato per Nikon D7100, viene venduto con una custodia in similpelle alla quale avrei preferito il canonico neoprene, ma va bene comunque.Dopo un primo test in coppia con Tamron 70-300 effettuato ieri sera in modalità M e messa a fuoco manuale, non posso che rimarcare risultati strepitosi (vedere foto della Luna in allegato, scattata ad F=600mm, f=11, t=1/200, ISO=320, cavalletto e scatto remoto mediante telecomando).Funziona perfettamente la trasmissione dei dati exif, addirittura le focali risultano tutte raddoppiate nei metadata delle foto.Montare il teleconverter comporta la perdita di due stop, tranquillamente recuperabili mediante diaframma / ISO, ma bisogna saperlo.Devo provare ovviamente con gi altri obbiettivi in mio possesso sia per la trasmissione dati exif, che per il risultato complessivo.Non ancora testato l'autofocus, avendo scattato in full manual la Luna.Chiudo evidenziando una qualità dei materiali eccellente e l'elevata precisione degli innesti a baionetta sia lato reflex, sia lato obbiettivo.Conto di aggiornare la recensione con test futuri.In definitiva, ottimo prodotto.