Question about Canon EF-S 17-55 f/2.8 IS USM Lens
Hello. The SD stands for Super Low Dispersion glass. It's a type of glass which is supposed to correct a lot of common light-transmission errors that naturally occur with optics used in this manner. All companies use "special" or "proprietary" methods of producing their respective high-quality lenses. The 35-200 tells you the focal length(how much zoom capability) you have. In other words, 35mm is considered a mild wide-angle lens while 200mm is approximately equal to a 10x pair of binoculars. Tokina makes lenses for a wide variety of cameras. There should also be a letter designation stamped on the rear of the lens mount. "O" for Olympus, "M" for Minolta, "N" for Nikon, "P" for Pentax, etc. Sometimes, there are 2 letters showing that the lens will fit cameras from 2 different companies.---Rick
Posted on Oct 02, 2009
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Posted on Jan 02, 2017
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