I've been shooting with 18-55mm and 55-200mm for two years and I've always wanted to replace them with a lens because a) I hate changing lenses and feel like I've had a few in the past missing out on great shots by -for; b) I hate lugging around extra weight and the 18-135mm weighs about half as much as the 18-55mm and 55-200mm combined. For two years I couldn't convince myself to pay that much for a lens that got so many bad reviews. claimed it was a mediocre lens for the price. Two months ago I finally decided to buy it and I was surprised! The quality of my copy is fantastic! I ran some tests comparing all three on my X-T10 and 18-135 with 18-55mm at each focal length and aperture. It's almost as good as 55-200mm and the only way to tell the difference between the two is to take a look at the pixels. And even then the difference is very small. I only lose about 1/2-2/3 stops of light, which is easily compensated for by the excellent OIS system that can give you up to 5 stops. It's not as wide as 55-200mm, but 95% of the time you won't miss anything (unless you're a wildlife photographer). 18-135 mm - the goalkeeper!
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