The Canon EF-S 18-135mm f/3.5-5.6 IS STM Lens is a significant upgrade from the standard at review time. It is an upgrade in many ways, but the 18-135's most attractive features are a wide 7.5x focal length range.
Looking at the lens at its widest aperture settings, it performs quite well for the price tag. Wide open at ƒ/3.5 at its widest angle of 18mm, the lens is sharp in the middle, tapering out to slightly soft corners; zooming in to 24-50mm produces even sharper results
The Canon EF-S 18-135 ƒ/3.5-5.6 IS STM employs an autofocus system called a "Stepping Motor", which allows the lens to provide smooth and quiet autofocus operation, particularly during video capture. The lens took well under a second to focus from infinity to close-focus.
The complex array of lens elements that allows the range of focal lengths in this lens leads to some dramatic results for distortion. When used in the wide angle configuration, the lens provides uniform barrel distortion up to around 28mm, with dramatic distortion in the corners.
*Image are for illustration purpose only.
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