When purchasing a good camera, ensure it also has a good lens because you can not change the lens especially for most of compact digital cameras. A good lens is essential to make clear and sharp images, choose a clarity glass lens and avoid a plastic digital camera lens.
Each Nikon, Canon and Pentax camera have their stick with camera lens, when you purchase ensure that the camera lens fit to tour camera. Carl Zeiss, Leica and Leupold are the specialty of lens manufacturer on those you can trust and no reason to be worry for using.
The types of the lens are determined by the Focal Length of the lens in mm. Normal lens (50 mm), wide Angle lens (20 mm to 35 mm) and telephoto lens (105 mm to 300 mm) are the common types of lens. The Focal Length of the lens where the amount of magnification and angle of view of the lens can be seen. A lens that can change Focal Length from a Wide Angle to a Telephoto is called as zoom lens (50mm to 150 mm).
For lenses that capable to be interchanged between film and digital cameras. The above description are the focal lengths for film cameras then to get the effective focal length on a digital camera the described value need to be multiplied by 1.6, since the speed of a digital camera lens is determined in f-stops, the faster lenses are more expensive and usually heavier.
The minimum distance from the camera lens that a subject must be focused is called as the Focusing Distance, when you are getting a camera with a close focusing distance you can concentrate with it on a telephoto.
When shooting in low light the sharper images can be made with help of a feature called vibration reduction, to counter any vibration in the camera.
To avoid disturb people around when camera is focusing USM stands for Ultrasonic Motor feature of Canon lens might be used to give high speed and silent auto focus.
Filter thread that allows you to screw on a filter may be necessary. Ensure that you purchase a lens have a filter thread that can help when you need.
Finally find the lens that suits both for you and for your camera but add to your lens collection only when you have a specific need for a particular digital camera lens because great images is not created only by a great camera lens.
