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For years, the Canon Corporation has put into focus the need for high-quality image stabilization in all of its lenses, especially those of a telephoto type. In many instances when telephoto is needed, a photographer will find themselves in a situation where they cannot use a tripod. In these situations, a high-quality in-focus image has been next to impossible in the past. However, this is the reason for new stabilization technology. This EF mount Canon 100-400 mm Telephoto Zoom Lens is designed for use by professional photographers. This particular item is continually touted for its ability to capture motion at sporting events as well as its ability to foreground focus for portraiture, making it a rather versatile addition. Making use of fluorite as well as UD glass, the lens promises to block out color problems that originate in a spectrum issue within the lens itself. The FeaturesThis lens includes seventeen elements along with floating mechanisms, which make it highly specific in its focusing power as well as versatility in subject and capability. This product includes fully manual rear focusing capabilities with the ability tor a maximum magnification of 400 mm. If the photographer needs to focus on more up close images, the lens has the ability to focus as close as six feet. The maximum aperture of the lens is up to f5.6, which allows focusing versatility. In addition, the product boasts two different stabilization modes making it quite easy for the photographer to choose between portrait focusing as well as far off telephoto capabilities. The lens weighs right at three pounds and includes a length of 7.4 inches, with just over a three-inch diameter. If the photographer wishes to make use of filters, the product makes use of those with a 77mm diameter. In addition, the lens is fully compatible for high quality extenders of the linear variety. . The manufacturer suggests a retail price of eighteen hundred dollars, which is quite competitive when compared to other manufacturer lenses of the same variety. The FeedbackProfessional photographers who have reviewed the Canon EF 100-400mm f4.5-5.6L IS USM Telephoto Zoom Lens have had two things to say about it, including the fact that it is a highly capable lens, which provides high quality images, but that it can be a bit intimidating in size and function. While the negative reviews are quite minimal, it is indicated that the lens includes a push pull style focusing mechanism, which can be quite different for those who are used to standard turning focus. The positive feedback continually says the same thing: the lens offers high quality imaging for a variety of events and situations. Besides the fact that it can include a bit of a learning curve, the item is continually a favorite of professional photographers. Mostly advertised as an excellent telephoto option for faced paced environments like sporting events, the lens also has the capability to make use of wide apertures for portraiture as well. Offering two settings for image stabilization, the product works well for hand-held and tripod situations.