Digital SLR Review

One of the biggest advantages of DSLR cameras (ie semi-professional and professional) is the ability to use different lenses. However, deciding what to buy and what objective lens is suitable for a specific type of photography is a bit 'difficult. In this article we know the advantages and the main purpose of using certain types of lenses, hoping that we make it easier for you to decide.Let 's a look at different types of lenses and learn when you are used.Prime Lenses and Zoom Lenses: A lens with fixed focal length is called a primary goal.

This is contrary to zoom lenses that have different focal length. Since the focal length is fixed, in order to compose a picture that will need to adjust the distance to the scene to have specific people or objects in photos. In zoom lenses, the zoom level will be used to compose the photo INSTEAD of changing the distance of the camera lenses have a build scene.Prime easier Than zoom lens that can be designed to have much better performance, clarity and quality than zoom lenses. Zoom lenses usually have different types of errors in different focal lengths, while the lenses are the first few of these errors.

Prime lenses are very compact and much smaller than zoom lenses. Their price is cheaper than zoom lenses in the same aperture size. You can buy a 50mm f/1.8 lens for Canon or Nikon for about $ 100, while a zoom lens with the same aperture size might cost more than $ 1000.Aperture Dimensions: opening larger (ie smaller f number) as f / 1.4 f / 1.8 and F / 2 provide more light to the camera sensor, and therefore are faster lenses (photos can be taken at a shutter speed faster). However, zoom lenses with larger aperture size would be incredibly expensive.

F number is calculated by dividing the focal length to aperture diameter. For example, if the aperture size (IE window aperture) of 50mm is set at 6.25 mm is the number f = 8 50mm/6.25mm which means that with this aperture size, the goal was set to f / 8.Normal Prime Lens: A primary goal (ie with a fixed focal length) with a focal length of 50mm is called a normal lens. Photos taken with a 50mm lens appears similar to what our eyes see the scene (point of view, angles, etc.). Canon, Nikon and some other brands of DSLR, as stated in the previous section, sell the normal lenses with aperture f/1.

8 or better size (like f/1.4) with a low price. An f/1.8 lens is suitable for normal conditions of relatively low light and produces sharp, bright photos.Short zoom lenses: Zoom lenses covering the range up to 50-60mm can be considered in this category. Examples of these targets are 35-70mm f/3.4-4.5 and 28-70mm f/3.5-4.5 lens. Today, some models of Canon and Nikon are provided with a good 18-55mm f/3.5-4.5 lens. These lenses can be considered as a short zoom lenses cover wide and super wide zoom range.

Super: These are the types that cover a range super great. Like a super zoom lens 18-200mm wide-angle coverage and tele-focal lengths.However the most important feature of these lenses is their convenience to avoid changing lens. These lenses can offer almost any focal length you need and are therefore sometimes referred to as "slow walking". If convenience is not a question for you, we recommend using more than one lens that have a better performance in a smaller focal length range.Wide-angle and ultra wide-angle lenses: Lenses with focal length 21 mm to 35 mm are usually called wide-angle lenses.

Lenses with a focal length less than 21 mm are called ultra wide-angle lenses. These lenses can be both slower than the first or variable focal length (zoom). The first wide-angle lenses have better opening size (in the range of f / 1.4 to 2.8) than wide-angle zoom lens (f/3.5-f/4.5 aperture size of most of the time). Again zoom types provide flexibility, while the lenses provide the first picture sharper, cheaper price and large aperture size (ie better pictures in low light). There are zoom lenses that cover only broad ranges and super.

These include 21-35mm 18-28mm coverage angle lenses.The large is also one of the benefits of wide and super slow. An ultra wide sometimes can capture up to an angle of 90 degrees or even ultra-wide lenses and normally more.Wide perspective distortion. This type of image distortion

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