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I am so impressed with the Sigma EX 1.4x teleconverter APO EX DG lens for Canon. I'm using with a Canon 70D camera and a Sigma 105mm Macro lens. I'm using it for nature photography, and the increased magnfication allows me to get farther away from skittish subjects such as bees and butterflies. The TC does cause the AF to be a tiny bit sluggish, but it's not bothersome, and the focusing is really spot-on. You lose one stop of light but the camera controls that--for instance, my lens opens up to f/2.8 without the TC on, but with the TC on, the camera stops the minimum at f/4. My lens was released in 2014 so understandably its older technology has slower AF than my Canon 70-300mm lens that was just released in December 2016. For my use, I'm loving this added piece of equipment.
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