Kenko 2.0X PRO 300 TeleconverterDG-Canon- EOS Review

I bought this to go between my D80 & my Nikon 80-200 AF 2.8D when I need extra focal length. Other than quickly confirming that AF & metering works with all my lenses, I have not used it with any other camera/lens combination. There is a noticeable loss of sharpness when using the converter, but that's compared to a very sharp lens without the converter. Overall, image quality is satisfactory.

If your reason for choosing this over the Nikon converter is autofocus on AF lenses, then you should be aware that autofocus only works well in very bright lighting. Autofocus does not work in low light, such as poorly lit rooms and twilight hours. The camera tries but focus lock is never achieved. It works slowly and inaccurately in moderate light, such overcast days. Focus locks, but it's often not sharp. It's possible that my camera is to blame, but you should expect to focus manually much of the time with this converter. However, if your use will be mostly outdoors in good weather then the autofocus will likely meet your needs.

Due to the price difference and lack of autofocus with AF lenses, I didn't investigate the Nikon converter. Had I known that I would focus manually on 80% of my shots with the Kenko converter, I would have tried the Nikon to see how the picture quality compared.

One additional note: While I only tried a couple test shots and would not recommend counting on this, in bright light this converter worked with my 18-135 f3.5-5.6 kit lens & my 70-300 f4-5.6 VR lens (for a 35mm equivalent of 900mm f11). Nikon's guidance that autofocus and metering only work at effective apertures of 5.6 or larger appears not to be set in stone. I plan to play more with the 300mm. I'll try to remember to post how it works out.

Update: I recently did some experimentation with the 70-300. Metering worked fine, but the autofocus was consistently off just a little bit. I did get some nice shots using manual focus though. I wouldn't buy this for use with an f5.6 lens, but that doesn't mean you can't get some use out of it if it's in your bag for other reasons.

Buy it here now!