The starting point for all your digital camera information
Learn about different types of digital camera lenses.
The optical lens is one of the most neglected and misunderstood components of the digital camera. The purpose of the lens is to allow more light into the digital camera while maintaining the sharp focus of the digital image.
There are two technical specifications for every lens of a digital camera. When the lens is focused on infinity, the distance from the lens to the point of focus is the focal length. As the focal length gets shorter, the depth of field gets better and the focus is not as important. This is achieved with a wide angle lens where objects closer to the camera seem larger and closer. On the other hand, through a telephoto lens you only see a small portion of the scene but it seems very large. However, this causes the background to be out of focus. The second technical specification is the aperture, which is the size of the opening of the lens. The larger the focal length the larger the aperture needs to be to allow enough light in to expose the image. The f-stop is used to define the amount of light that passes through the digital camera’s lens. The smaller the f-stop value the larger the amount of light that passes through the lens.
There are two types of zoom lenses for digital cameras that can magnify your image from 2x, 3x, 4x, 10x and more. The first type of zoom lens is a optical zoom lens which actually increase and decreases the focal length. These lenses magnify the image and give the best results. The second type is a digital zoom lens. These lens do not change the actual length of the lens but instead enlarge the central portion of the digital image. This creates a pre-cropped effect which give an appearance of zooming in at the expense of reduced image resolution and quality.
These are the best places to purchase digital cameras lenses online:
bestbuy.com - Digital Camera lenses
When it comes to selling Digital Cameras, RitzCamera.com is the source.
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