Digital Camera Zoom Lenses

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There are two types lenses of zooms used with digital cameras: optical and digital.

1. Optical Zoom

An optical zoom changes magnification by moving glass in the lens, changing the image falling on the sensor. Using an optical zoom maintains picture quality.

Zoom Ranges and 35mm Equivalents

Optical zoom lenses usually have a specification called “equivalent in 35mm.” This tells you the zoom range of the digital camera compared to a 35mm film camera. Typical 35mm equivalent zoom ranges you will see listed are 35mm-70mm or 35mm-105mm.

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Optical Zoom as 2x, 3x, 5x…

Taking the 35mm-105mm example above, we divide 105 by 35 to get a 3x zoom. A 28mm-105mm would be approximately a 4x zoom, and a 35mm-350mm would be a 10x zoom.

2. Digital Zoom

A digital zoom does not change, magnification. It simply crops the image on the sensor to magnify the image. Because less sensor is used, you use fewer pixels. This decreases picture quality. When comparing cameras, always use the optical number as this is much more important. You can get the same effect as a digital zoom by using software to crop the photos.

Note About Digital Zoom

As digital cameras become more sophisticated and powerful they are becoming capable of delivering “optical tricks” that render pictures that are remarkably stable and good looking. Only recently, cameras “digital zooms” are getting much better. Like all things though some companies are better than others. Do your research free lawman broken arrow divx download .

Lens Tips And Tricks

1.      If the viewfinder is blocked by the accessory lens, compose your pictures by looking at the LCD. This will ensure that you can see exactly what the CCD will see.

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2.      Be careful when using an on-camera flash. With close-up lenses, there may not be enough distance between the flash and the subject for even illumination. If you’re using a large lens adapter, you could see a shadow cast from it on your scene.

3.      With wide-angle attachments, make sure your camera’s lens is set to the full wide-angle position to maximize the widening effect.

4.      For your telephoto attachments, set the camera’s zoom lens to the maximum telephoto focal length.

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