Extension tubes allow you to focus closer than minimal focus allows, and are often used for macro photography as well as tight portraits. Canon makes two extension tubes: the Canon Extension Tube EF 25 II, and the Canon Extension Tube 12 II. The 12 II is the more useful for me, while the 25 II focuses closer. Kenko also manufactures extension tubes for Canon and is less expensive. No optics are used in extension tubes — all they do is lengthen the distance from the back of the lens to the sensor. No exposure compensation is necessary as it is automatically read by the camera's metering system.
Note The 25II is recommended for focal lengths of 50mm and longer. The 12 II is compatible will all lenses except the 15mm fisheye, the 14mm f/2.8L, and the MP-65mm f/2.8 macro lens (a manual focus macro lens that can fill a 35mm frame with a grain of rice). If you need it, there it is.
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Compared to film cameras, digital cameras are easy to use, fun and extremely versatile. Every day there’s more features being designed. Whether you have the cheapest model or a high end model, digital cameras can do an endless number of things. Let’s look at how to get the most out of your digital camera.