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I have recently purchased the 18-135 stm lens. I use it on a Canon 60D. I have noticed that it takes a while to achieve autofocus, especially at longer focal lengths. In a couple of cases the shutter has fired before autofocus is achieved and I end up with a totally blurred image.
I have not tried the lens on a different body.
I'd like your thoughts about whether this problem is strictly a lens problem or could it be related to communication between the lens and the camera. I do like the lens for its clarity (when af is achieved) and large range.