Is Canon EF-S 18-135 STM lens too soft in large apertures?

Started Feb 28, 2013 | Questions thread
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massud
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Is Canon EF-S 18-135 STM lens too soft in large apertures?
Feb 28, 2013

Please look at the following side-by-side comparison of exposures of my 18-135 STM lens in two different apertures (100x100 crop). As you can see, it is too soft in f/3.5 (the largest available aperture). I repeated this test with different focal lengths (50mm and 135mm) and images taken with the largest apertures are always too soft. I could not find any review/sample image on internet that confirms such a big difference in sharpness. Is this normal?

Left: 18mm f/3.5 1/100 Sec. Right: 18mm f/5.0 1/50 Sec.

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