Extension tubes are close-up accessories that provide magnification from approximately 0.3 to 0.7 and can be used on many EF lenses, though there are exceptions. Extension tubes are placed between the camera body and lens and connect to the camera via eight electronic contact points. The function of the camera and lens is unchanged, and you can combine extension tubes for greater magnification.
Canon offers two extension tubes, the EF 12 II and the EF 25 II. Magnification differs by lens, but with the EF12 II and standard zoom lenses, it is approximately 0.3 to 0.5. With the EF 25 II, magnification is 0.7. When combining tubes, you may need to focus manually.
Extension tube EF 25 II is not compatible with the EF 15mm f/2.8 Fisheye, EF 14mm f/2.8L USM, EF 20mm f/2.8 USM, EF 24mm f/1.4L USM, EF 20-35mm f/3.5-4.5 USM, EF 24-70mm f/2.8L USM, MP-E 65mm f/2.8 1-5x Macro Photo, TS-E 45mm f/2.8, and EF-S 18-55mm f/3.5-5.6 (at wide angles) lenses.
Additionally, you can use screw-in close-up lenses. Canon offers three lenses that pro vide enhanced close-up photography. The 250D/500D series uses a double-element design for enhanced optical performance. The 500D series features single-element construction for economy. The working distance from the end of the lens is 25cm for the 250D, and 50cm for the 500D.
8.13 Extenders, such as this Canon EF 1.4x II mounted between the camera body and the lens, extend the range of L-series lenses. They increase the focal length by a factor of 1.4x, in addition to the 1.6x focal length multiplication factor inherent in the camera.
In the Field with the Rebel XSi/450D
This chapter begins with an overview of some commonly used photographic composition approaches. The second part of the chapter covers a wide variety of photography subjects that you can explore with your Rebel XSi/450D. In addition to the examples, there are ideas for thinking about photographing these subjects. Whether you shoot all or only some of the subjects in this chapter, I think you'll gain a full appreciation of the image quality and versatility that the XSi/450D provides.
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Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.