Summary: I would recommend this TC only to those who would have the patience to use it properly. Most people would probably be better off with the 1.4x model, which is much easier to use. With a long lens like the Nikon 70-300, the effective focal length can be so great that holding for a sharp image becomes...
Pros: Good magnification; works well; adds little or no softness or distortion
Cons: A bit difficult to use; does not autofocus on many zoom lenses
Summary: I love this little device as a great addon for my lenses. It is a quick and easy way to extend the range. If you can't afford a fast long lens this might be the item for you. It doubles your zoom capability.
Excerpt: I use this lens with a Canon 70-300mm lens.The Kenko gives automatic focusing up to about 200mm,but from there to 300mm it does not.One must focus manually in this region-which is no big problem.The teleconverter is well made and has the look of qualityI would recommend it.
Pros: Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Rugged, Strong Construction
Great product in manual focus. Good image quality. I would recommend it.
31 July 2012
Summary: I use this teleconverter with my Nikkor 55-300mm/f4.5-5.6G lens and a D5100 and it works great in manual focus. Don't expect to use AutoFocus with this lens. Image quality is quite good and you can take great shots even with no tripod if you are careful.
Excerpt: I have excellent results with this converter using my Nikon 300 f4 lens, even hand held most of the time. I shoot with a Nikon D3s so I do push the ISO up to keep my shutter speeds over 600. Technique is key with this combo. It doesn't work with my 80-400 over 300mm zoom.
Pros: Consistent Output, Fast / accurate auto-focus
Excerpt: Bought this product to use with a Canon 70-300DO lens for protability in the field. It works well so far and I have tested it on other lenses including 28-135. It AF at all ranges and all the lenses tested. Also on several Canon camera bodies from Pro to a 30D.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight