VII.NEW ACCESSORIES AND LENSES | 52 |
| |
Canon EF-S18-200mmThis new high magnification, wide-to-telephoto EF-S zoom lens is the ideal kit lens for the f/3.5-5.6 IS lens EOS 50D, offering a 35mm equivalent focal length of 29mm to 320mm (11x), and featuring
Canon’s advanced Optical Image Stabilizer technology. It is also available separately and is compatible with all Canon DSLRs using APS-C sized sensors, including the EOS 40D, 30D, 20D, and all versions of the EOS Digital Rebel and Rebel series cameras.
The compact size and weight on this lens, plus its professional lens design and construction, improved AF speed and advanced IS system make it an extraordinary value for the price. The optical arrangement includes two UD glass elements and two high-precision GMo (Glass Molded) aspherical lenses among the total of 16 lead-free glass elements in 12 groups. These UD and aspherical lens elements help reduce distortion and chromatic aberrations. Close-focus performance is excellent: the lens focuses down to about 1.5 feet (0.45m), where it can fill the frame with a subject about the size of a book of matches. In addition, Super Spectra Coatings on all elements help to minimize lens flare and ghosting.
Canon’s advanced Optical Image Stabilizer technology increases the lens stability by up to 4 shutter speeds, essentially extending the performance of the lens in low-light situations to that of more expensive f/2–f/2.8 non-stabilized lenses. For example, at 200mm focal length, the recommended lowest shutter speed for sharp photos is 1/200 sec. But with the IS turned on, most photographers will be able to take sharp photos at speeds as slow as 1/30th sec. or even 1/15th sec., allowing creative control of the aperture to increase depth of field, balance the ambient lighting to reduce underexposed backgrounds, or increase motion blur as desired.
External and Cross Section of EF-S 18-200mm f/3.5–5.6 IS
| | Rubber ring | Focusing Ring | Closest focusing |
| Hood Mount (Bayonet) | distance mark |
| | |
| | Zoom Ring | | Zoom Index |
| | | |
EMD
Silver ring | Contact | Image stabilizer switch |
| | Focus mode switch |
| at 200mm | |