The Canon 18-135mm lens is a popular choice for photographers who want a versatile zoom lens that can handle a wide range of shooting situations. There are two versions of this lens - the USM (Ultrasonic Motor) and the STM (Stepping Motor).
The Canon 18-135mm USM lens is the older of the two versions and was first released in 2009. It features a fast and quiet autofocus system, thanks to its ultrasonic motor, which allows for smooth and accurate focusing. The lens has a variable maximum aperture of f/3.5-5.6, which means that the maximum aperture will change depending on the focal length you are using. This lens is a great choice for still photography and works well in low light situations.
The Canon 18-135mm STM lens was released in 2012 and is a newer version of the lens. It features a stepping motor that provides smooth and quiet autofocus, which is especially useful for video recording. The lens has a slightly wider maximum aperture of f/3.5-5.6, which can provide a slightly shallower depth of field compared to the USM version. The STM lens also features Canon's Image Stabilization technology, which helps to reduce camera shake and blur when shooting handheld.
Both lenses are compatible with Canon's APS-C sensor cameras and have similar focal lengths and zoom ranges. They are both versatile lenses that can handle a variety of shooting situations, from landscapes to portraits to action shots. The USM version is a bit older and lacks some of the newer features found on the STM version, such as image stabilization and quieter autofocus. However, it still provides fast and accurate autofocus and is a good choice for still photography. The STM version, on the other hand, is a better choice for video recording due to its quiet autofocus and image stabilization features.
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