![]() Canon claims an efficiency of 2 f-stops at 1:1 magnification and 4 f-stops at standard focus distances. The Canon lens feature a new "hybrid" IS which does not only compensate "conventional" shake but also linear movements. Nikon won the race here although their VR is not all that efficient in macro situations. It took Canon quite a while to release their first macro lens featuring an image stabilizer. The Canon EF extension tubes are supported whereas the EF tele converters cannot be used. Similar to the non-L macro lens it features a "true" inner focusing system so the lens does not extend when focusing towards closer focus distances. The broad rubberized focus ring works very smooth. The lens body is made of very high quality plastics and a metal mount. The build quality is excellent but then we've expected no less from a professional grade "L class" lens. In theory this does allow a higher degree of corrections but you also risk more flare in contra light situation. Just like most IS lenses the design complexity increased quite a bit from only 12 elements in 8 groups in the "conventional" macro lens to 15 elements in 12 group. The lens does not replace the highly popular EF 100mm f/2.8 USM macro but is meant as a higher quality option featuring Canon's proven lens-based IS (Image Stabilizer). ![]() It's a full format lens but you can naturally also use it on your APS-C DSLR where its field-of-view is equivalent to about 160mm in classic terms. The Canon EF 100mm f/2.8 USM L IS macro is the 6th macro lens in the Canon EF lens lineup. Please forgive us but for obvious reasons we've reused some portions of the corresponding full format review of this lens. As this motor not only allows for fast and smooth AF but is also small in size, it makes it possible for the lens that utilize it to be around the same size as lenses with STM.Kindly provided for testing purposes by Wolfgang Scholten! Moving along the top of the slider, the Nano USM directly drives the main AF power source. The Nano USM is shaped like a computer chip, and has 2 transducers in its center.Ī cross section of the EF-S18-135mm f/3.5-5.6 IS USM, released in 2016 and the first lens to carry the Nano USM. Also very suitable for movie-shooting, its high speed AF is able to handle scenes with subjects that are moving at a fast speed as well as those with unpredictable movements. Its main benefit lies in enabling quiet, smooth AF operation in compactly-sized lenses such as standard zoom lenses. It possesses a speediness and responsiveness that rivals that of the Ring USM, combined with a control that equals that of STM (lead screw-type). Computer chip-shaped (a factor that allows a more compact lens design) with power sources in the form of transducers, it connects directly to the AF actuating mechanism. Thin and compact, this USM, the latest to be developed by Canon, made its debut in 2016 on the EF-S18-135mm f/3.5-5.6mm IS USM. Nano USM-The thin and tiny USM motor that achieves fast and smooth AF It’s not an exaggeration to describe Nano USM as the most ideal motor for normal-use lenses that are meant to handle both still photography and movie shooting. ![]() And in 2016, Canon introduced Nano USM, which not only realizes a high speed AF that rivals that achieved by Ring USM, but also is able to operate quietly and seamlessly. In 2002, Canon contributed further to the downsizing of lenses with the development of the Micro USM II, which is about half the size and weight of the Micro USM. Meanwhile, the Micro USM can be employed on many types of lenses because it is low in cost and not subject to restrictions on the lens diameter. It is especially useful for driving lenses such as large-diameter or super telephoto ones due to its high torque, and it also allows for full-time manual focusing. The round-shaped Ring USM is simple in structure, and is best suited for use in a circular lens tube. Not only does it consume little power, it has high efficiency, torque and response, enabling high-speed focusing with almost no operating sound emitted. USM drives the lens by transforming ultrasonic vibrations into rotation energy. USM (Ultrasonic Motor) was first put into practical application in the world by Canon. ![]()
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