Canon EF-S 18-135mm f/3.5-5.6 IS STM Lens Review by Gary Wolstenholme at Ephotozine: Descent but not exceptional, and very expensive when not sold as part of a kit.

Canon EF-S 18-135mm f/3.5-5.6 IS STM Lens Review by Gary Wolstenholme at Ephotozine: Descent but not exceptional, and very expensive when not sold as part of a kit.

The old Canon 18-135mm IS USM lens reincarnated with a stepper motor, more suitable for video recording where smoothness and silence during AF operation is a prerequisite:

"At maximum aperture and 18mm sharpness is already excellent in the centre of the frame, with the clarity towards the edges of the frame being not too far behind. Peak sharpness is achieved between f/4 and f/5.6 for this focal length, and sharpness is excellent across the frame at these apertures.

With the lens zoomed to 50mm, sharpness at maximum aperture remains very high, with excellent clarity being recorded across the frame by Imatest. Peak sharpness across the frame is achieved between f/5.6 and f/8 for this focal length where sharpness is excellent across the frame.

As is usually the case with zoom lenses covering a wide range of focal lengths, sharpness falls away somewhat at maximum telephoto. Still, at f/5.6 clarity in the centre of the frame is still very good, although the quality achieved towards the edges of the frame drops to fairly good levels. Peak sharpness across the frame is achieved between f/8 and f/11 at 135mm."

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