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Sigma 200-500mm Ultra-Telephoto Lens Canon DSLR

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Sigma 200-500mm f/2.8 APO EX DG Ultra-Telephoto Zoom Lens for Canon DSLR Cameras …

Sigma 200-500mm f/2.8 APO EX DG Ultra-Telephoto Zoom Lens for Canon DSLR Cameras
by Sigma This ultra telephoto zoom lens offers a fast aperture of F2.8 at the 500mm focal length and F5.6 at the 1000mm.

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  • 1. ==== ====Click Link Below To Order Nowhttp://amzn.com/B0013D8VDQ==== ====One of the most important advantages of DSLR cameras (i.e. semi-professional and professional)is the ability to use different lenses. However deciding on what lens to buy and what lens issuitable for a specific type of photography is a bit difficult. In this article we learn about advantagesand main purpose of using specific types of lenses, hoping that we make it easier for you todecide.Lets have a look at different types of lenses and learn when they are used.Prime Lenses and Zoom Lenses: A lens with a fixed focal length is being called a prime lens. Thisis opposite to zoom lenses which have varying focal length. As the focal length is fixed, in order tocompose a photo you will need to adjust your distance to the scene to have specific objects orpeople in the photo. In zoom lenses, you will use the zoom level to compose the photo instead ofchanging the distance of camera to the scene.Prime lenses have a more simple build than zoom lenses and they can be designed to have verymuch better performance, sharpness and quality than zoom lenses. Zoom lenses normally showdifferent types of errors in different focal lengths while prime lenses have the least amount of sucherrors. Prime lenses are very compact and much smaller than zoom lenses. Their price is alsocheaper than zoom lenses in an equal aperture size. You can buy a 50mm f/1.8 lens for a Canonor Nikon camera for around $100 while a zoom lens with the same aperture size might cost above$1000.Aperture Size: Bigger aperture sizes (i.e. smaller f number) like f/1.4, f/1.8 and f/2 provide morelight to the camera sensor and therefore are faster lenses (photo can be taken in a faster shuttertime). However zoom lenses with bigger aperture size might be unbelievably expensive. F numberis calculated by dividing the focal length to the aperture diameter. As an example if the aperturesize (i.e. diaphragm window) of 50mm lens is set to 6.25mm the f number will be50mm/6.25mm=8 meaning that with this aperture size, lens has been set to f/8.Normal Prime Lens: A prime lens (i.e. with a fixed focal point) with a focal length of 50mm is calleda normal lens. Photos taken with a 50mm lens seem similar to what our eyes see at the scene(perspective, angles etc). Canon, Nikon and some other DSLR brands, as mentioned in previoussection, sell normal lenses with f/1.8 aperture size or better (like f/1.4) with a cheap price. An f/1.8normal lens is suitable for relatively low light conditions and produces sharp and bright photos.Short Zoom lenses: Zoom lenses which cover the range of up to 50-60mm can be considered inthis category. Examples of these lenses are 35-70mm f/3.4-4.5 and 28-70mm f/3.5-4.5 lenses.Nowadays some Canon and Nikon models are offered with a cheap 18-55mm f/3.5-4.5 lens.These lenses can be considered short zoom lenses while they also cover wide and super wide
  • 2. range.Super zoom lenses: These are the types which cover a super big range. Super zoom lenses like a18-200mm lens cover wide-angle as well as tele-focal lengths.However the most important feature of these lenses is their convenience of avoiding lens change.These lenses can offer almost every focal length you need and therefore they are sometimesbeing called as "walk around lenses". If convenience is not a matter for you, we recommend you touse more than one lens which have a better performance in a smaller focal length range.Wide-angle and Ultra Wide-angle lenses: Lenses with a focal length of 21mm to 35mm arenormally called wide-angle lenses. Lenses with a focal length of less than 21mm are called ultrawide-angle lenses. These lenses can be either prime lenses or varying focal length ones (zoomlenses). Wide-angle prime lenses have better aperture sizes (in the range of f/1.4 to f2.8) thanwide-angle zoom lenses (aperture sizes of f/3.5-f/4.5 most of the time). Again the zoom typesprovide flexibility while prime lenses provide sharper photos, cheaper price and bigger aperturesize (i.e. better photos in low light conditions). There are also zoom lenses which just cover wideand super wide ranges. These include 21-35mm, 18-28mm lenses.The large coverage angle is also one of the benefits of wide and super wide lenses. An ultra widelens can sometimes capture up to a 90 degrees angle or even more.Wide and ultra wide lenses normally have perspective distortion. This kind of distortion causes thenearby images to be photographed very much bigger than far away objects. These lenses aresuitable for taking photos inside buildings, street photography and so on.If you mostly shoot inside buildings, a lens covering focal lengths of 28mm or below will besuitable. This kind of lens allows you to capture a considerable angle of a scene without the needto have a big distance with the subject(s). However, if you shoot portraits and nature a longerrange lens will be more useful. In these cases a 35-135mm lens is very good.Long telephoto lenses: Lenses with a focal length of 135mm or above are normally considered aslong telephoto lenses. Tele lenses which have varying focal length are called telephoto zoomlenses while those with a fixed focal length are simply called telephoto lenses. You can easily find55-200mm, 55-250mm, 70-300mm, and similar telephoto zoom lenses for most of the DSLRbrands. However because of the big range of the lens and complicated design, different focallengths of the lenses might show different errors and quality. These lenses normally have a lowerperformance than short zoom lenses and fixed focal length telephoto lenses. A 200mm telephotoprime lens is an example of non-zoom telephoto lenses.Medium telephoto lenses: Lenses with focal length of the range 85-135mm are sometimesreferred as portrait lenses. This is because their perspective distortion is low and a suitabledistance between the subject person and camera can be maintained. Many telephoto zoom lensescan be used in this range, but they are heavier, bigger and their maximum aperture size is smallerthan prime lenses. However if you shoot a lot of portraits, you would rather use medium primetelephoto lenses like with a focal length of between 85mm and 105mm maximum aperture size off/2. Prime medium telephoto lenses have less perspective error and as mentioned earlier theirimage quality is sharper and brighter and bigger aperture size prime lenses are cheaper than
  • 3. zoom lenses with the same maximum aperture size.Macro Lenses: Macro lenses are designed to provide very high level of magnification and alsovery short focusing distances. In normal zoom lenses minimum focus distance (i.e. the distancebetween lens and the object) is normally larger than 30 cm. This distance is a few centimetres formacro lenses so you can take photos from a shorter distance and have a sharp and very detailedphoto of a very small object (like a small flower or a bee).Mac Sarmady writes for Society50 social networking website. You can visit Photography Club ofSociety50 to ask your questions or just to get advise on any photography issue.Article Source:http://EzineArticles.com/?expert=Mac_Sarmady==== ====Click Link Below To Order Nowhttp://amzn.com/B0013D8VDQ==== ====