Bought this lens for an African photo safari. I read the reviews beforehand and bought it with some hesitation, realizing the potential limitations of this type of lens. Thought it would still be a useful device for traveling with distant wildlife shots. However, I was wrong, the lens was a waste of money. I used it with my Canon 70D with two different lenses, an 18-135mm telephoto and a 55-250mm telephoto. The autofocus function did not work on either lens, even in bright daylight. Manual focusing was difficult on all types of moving subjects. Camera movement in the images was very pronounced even with stabilization. Back in the country I contacted the support team. I was told they were "sorry" but there is a 30 day return policy (the lens was purchased just over a month ago). If you're thinking "one of these might come in handy in your camera bag," don't waste your money. There are many other gadgets that offer much more value.
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