For the price this lens performs very well in low light and the autofocus is very fast. It will hunt and seek in some situations, but my R5 compensates for this well with its internal autofocus system. This thing is VERY loud when I'm trying to concentrate, it reminds me of a crying puppy that needs attention as it gets the job done I deal with it. All in all you get a good lens for more than half the price of the Canon version. So far satisfied
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