July 23, 2007

Look at Zoom Lenses for camera

Here is the general describe kinds of zoomlens:
Optical
Optical zoom uses the lens mechanism to change the focal length of the lens and allows the lens to zoom closer or farther away from the subject. Optical zoom maintains its quality at all levels. This is the most important type of zoom in a digital camera. A 10x zoom on a digital camera is roughly the equivalent of a 28mm to 200mm zoom lens on a 35mm film camera. The zoom factor of most optical zoom lenses ranges from 1.2x to 10x.

Digital
Digital zoom does much the same thing as zoom in Photoshop. The camera selects part of the digital image and saves only that part of the photo. Digital zoom reduces the actual resolution of your image, increases noise, and emphasizes shaky camera syndrome. Avoid using digital zoom if possible. If you need to accomplish a digital zoom effect, cropping the best photo you can get in Photoshop later is best. Digital zooms range from 2x to 10x.

Zoom Ratio
The difference between the size of the image that is projected onto the film at the widest (or smallest focal length) setting of a zoom lens and the size at the narrowest (or longest focal length). A 10x zoom lens magnifies the image in the narrow end of the lens exactly 10 times as much as the image at the wide-angle end.


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