Summary: Focus is very fast even with extension tubes + this 1.4x..The result was better without a close up lens..I tend not to use a close up lens so I can use the sigma ring flash EM-140..With Vivitar extension tubes+1.4x, there is no drop of quality except a little loss of light but even so, the autofocus...
Summary: My research was lacking, but there should be a statement about the camera only being available in manual mode with this device. This is a deal breaker for me, because we shoot surfers or moving targets.
Perfect Accessory for my 120~300mm Sigma Sport Lens
26 December 2013
Summary: Following my purchase of them new Sigma 120~300mm sport lens from Amazon I wanted to experience photography using the 1.4 teleconvertor. My Nikon teleconvertor would not mount to the Sigma lens, so I decided to purchase the Sigma version.
Summary: I was so looking forward to it when I bought this project online and found that it cannot work with my Canon EOS 60D as stated that it could. :-( Very sad. When I put it on, I could not fit my 18-200mm lens that comes with camera as kit. I am giving it away as a prize for a photo contest instead.
Excerpt: This TC is compact, very similar to my Nikon TC of the same magnification. So it can fit on the lens and be left there if desired and it doesn't really add much to it in terms of weight or length but it adds a lot in terms of focal length and image quality.
Pros: Fast / accurate auto-focus, Strong Construction, Top Image Quality