Telephoto Lens
What is the difference between a telephoto lens and a zoom lens?
I have a Canon EOS Digital Rebel with an 18-55 mm lens. I want to get a lens that will get me closer to the action for sports photos for example. I also will be using it for landscapes and other outdoor photos.
Your 18-55mm lens is a zoom lens, all it means is that the lens has a variable focal length between X and Y.
A telephoto lens is one that is greater focal length than the "normal" lens for a particular type of camera. On a 35mm, that is anything more than 50mm. On a 645 or 6X6, that is anything greater than an 80mm.
On your Digital Rebel with the 1.6x crop factor, it is anything greater than about 35mm. Your 18-55 is actually a short telephoto, with an equivalent field of view of approximately 29-88mm as compared to a 35mm camera.
What you can get to fulfill your need varies mostly with your budget. The Canon 75-300 III is the least expensive method to get a lot more reach, but is also the worst option. Better, yet still fairly low cost, is the Sigma 70-300 APO. Make sure it is the APO version, there are several.
Upping the budget a little, there is the Canon 55-250 IS, supposed to be a pretty good lens.
For another step up in price, there is the Canon 70-300 IS, which is an image stabilized version of the lens, but is a much better lens to begin with. For only a little more, you can get the Canon 70-200 f/4 L, a constant aperture zoom. Anything with an L in the name is a good lens. Even the 28-300 IS, even though it costs $2,300.
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 Canon EF 75 300mm f 4 56 III USM Telephoto Zoom Lens for Canon SLR Cameras  US $135.00
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 Lomography Soft Telephoto 110mm Lens US $24.99
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 NIKKOR Q 200mm F 4 telephoto lens Lens For Nikon US $18.27
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 Hasselblad 150mm CT telephoto lens requires lubrication service US $110.60
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 KOTAISHI VIDEO TELEPHOTO 20X LENS US $9.99
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 Canon EF 75 300mm f 4 56 III Telephoto Zoom Len Excellent Condition US $89.00
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