A telephoto zoom lens is a lens with varying focal lengths such as 18-55mm, 70-200mm or more that allows the photographer to zoom in on a distant subject. The zoom function can be performed by two lens groups inside the lens. Sometimes you will find other objects in your way or you may find that your subject is high above this is where you have to use a telephoto zoom lens. A zoom lens can magnify a part of the image so that it can appear as a full image. Today, most point and shoot cameras come with zoom feature with few buttons mounted on the main control panel of the camera.
A Telephoto Zoom Lens:
The Digital SLRs have lenses mounted on the front in which you can adjust the zoom by twisting the lens from left to right. By changing the focal length the lens can be magnified the farther the focal point is away from the camera the more magnified will be the image. The two "mm" symbol written on the zoom lens are the focal points that a lens is able to produce. However, lenses that have above 100mm focal range are classified as telephoto. The higher the number the farther your camera can zoom that allow you to zoom in on the action.
Many Digital SLR offer a 50mm to 200mm telephoto zoom lens with the kit. That means when you zoom in completely with the lens you are zooming to 200mm. If you are zooming out means you are going back to normal 50mm focal length. Telephoto lenses can also create different types of photographic effects of various scenes and landscapes. However, buying the right telephoto lens can be confusing if you are a beginner and you don't have knowledge about lenses. Therefore, you should learn everything about telephoto lens such as its usage, specifications, types and more before buying.
Telephoto Lens: It's Usage
The most basic use of a telephoto lens is to use them to shoot faraway objects and subjects. Apart from that, there are some other uses of them too such as to create different artistic effects, capturing wildlife and candid shots of people, etc. Moreover, it can also create a narrow field of view that affects perspective of photos. There are also some additional advantages that other type of lenses cannot offer.
There are some jargons on a camera lens that are completely useless if you don't know their meaning that includes aperture, focal length, etc. While aperture determines how much light a lens is capable of gathering that typically expresses in F-value such as F2, F8 or F11. These values will be listed as f/12 or f/8 that means the small number means a larger aperture. In a larger aperture the camera gathers more light but decrease (DOF) depth of field. For a telephoto lens you should choose the longer focal length that shallows the DOF.
As the name suggests the focal length determines the angle of view in a telephoto lens and how much an object or subject can be magnified. Telephoto lenses are normally having at least 80mm focal length. Apart from the focal length, there are many types of telephoto lens that depends on its focal length and field of view. There are short lens 85-135mm, medium lens 135-300mm and super lens 300mm+ that offers telescope like magnification.
Opteka High Definition Telephoto Zoom Lens for Nikon Digital SLR Cameras:
Today, many compact cameras offer an adapter to achieve full telephoto qualities that give longer focal length and more telephoto lens effects. The Opteka 650 - 1300mm high-definition telephoto zoom lens is a super telephoto lens for both the professional and amateur. The lens is extremely powerful and comes with built-in, rotating tripod mount so that you can attach your monopod or tripod. For your Nikon Digital SLR camera this product is highly recommended if you are going for wildlife or nature photography.