E+Cockrell


 * [|Elissa Cockrell]**

=Definition of "digital zoom"= Digital zoom is a __[|software]__ based method of approximating a telephoto lens on a camera. This is done through systems such as pixel doubling that merely make each pixel in an image larger to increase the size of the intended subject. Such systems are roughly equivalent to using photo editing software such as Adobe Photoshop to achieve the same result. This method of digital zoom creates images that are more blurred than the original. Newer cameraphones often achieve digital zoom by cropping away the outer portions of an image, leaving the user with a smaller photograph where the intended subject takes up a larger percentage of the final image. This method preserves image quality and is generally the preferred of the two methods. Digital zoom is a method of decreasing (narrowing) the apparent angle of view of a digital photographic or video image. ....



Optical zoom is the number of times the maximum [|focal length] of a zoom lens is larger than the minimum focal length. Consumer and prosumer cameras often come also with a digital zoom, which we will discuss based on an example of a 5 megapixel prosumer camera.

The on-camera zoom lens can zoom in and out optically by using the optical formula built into the lens. On the other hand, **//digital zoom//** can do the same by magnifying the existing image //using software//. Nikon Coolpix 990 has a 4x digital zoom in fix steps from 1.2x to 4.0x with an increment of 0.2x. Thus, this digital zoom capability effectively creates an optical/digital zoom of focal length from 138mm for 1.2x to 460mm fro 4.0x. In terms of telephoto power, the 2x digital zoom is equal to the [|**Nikon 2x Tele Converter TC-E2**], while the 3.0x extends the focal length to near 345mm and is equivalent to the [|**Nikon 3x Tele Converter TC-E3ED**]. Digital zoom can be used in both **A-REC** and **M-REC**

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