Title: A good outdoor lens
Product review: This is a good outdoor lens for sunny days photos due its small aperture. I'm using it to shoot dragonflies, other small animals, and birds. Unlike his sister, the 28-135 IS USM AF, it lacks the possibility of doing full autofocus manually when AF is set. This means that whenever we didn't manage to get focus automatically we must shift the operation from AF to MF. In the 28-135 IS USM AF we can make fine adjustments in the focus manually wihthout changing to MF. Otherwise this is a good lens. The USM motor function very well and the IS (image stabilizer) works proper and silently. To obviate its small aperture we can change the digital camera ISO to a high one, ex: 200 or higher. Bigger the shoot speed (above or equal to the focal length) better the photo, this a thumb rule in photography.
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