Digital Video Cameras - Optical Vs Digital Zoom

By Abner Allarey

A digital cameras zoom lens is effectively a cropping tool that lets you zero in on an important subject area to make it fill as much of the frame as you want. The lens does this optically by narrowing its view to exclude some subject area while magnifying those that are left within the frame.

When zooming optically with a digital camera, the picture area contains the full number of pixels for the selected resolution setting, but more of them are now devoted to the area you want, making its details clearer. Most digicams (and some camera-phones) include a digital zoom facility that works by selecting out a rectangular area in the centre of the field of view and enlarging it to fill the frame. All unwanted pixels in the surrounding area are discarded.

The cropped image then undergoes an interpolation process that adds new pixels on the basis of existing pixels in the image, these new interpolated pixels are created from existing image data, so you don't gain anything beyond a slightly tighter composition.

The actual picture quality will depend on how many pixels your camera used to make the image and how much of that image you crop away. It will also be influenced by the quality of the cameras interpolation algorithms. High levels of digital zoom require a lot of extra pixels to be added and this usually results in a loss of both image sharpness and contrast so digital zoom shots often look much flatter and fuzzier than shots taken with the cameras optical zoom lens.

Digital SLR cameras never include a digital zoom function but photographers who use these cameras can achieve a similar objective by enlarging and cropping shots when they edit them on a computer. The higher the cameras sensor resolution, the more enlargement is possible before the image starts to degrade and the greater potential for selective cropping.

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Digital SLR Camera - Enhance Photographic Skills

By Alden Jerry

Modern day world is full of technologies, which are helpful to users in various contexts. With rapid technological enhancement, many modern sophisticated devices have evolved, which are enriched with latest technologies. One of such modern and extremely advance device is Digital SLR camera, which are compact cameras of high picture quality. Now people are more modern and want better quality camera which can offer them excellent photographs.

The digital single lens reflex camera is comes with more improved and advance technology and provide the image of superior class. With these superb cameras one can capture interesting pictures without missing out any important shot. These are well equipped with excellent quality flash options to enhance the image quality. There comes no problem of light factor with these amazing digital cameras as they are compact highly advance camera of latest techniques. This is the only camera which is able to click images of wonderful quality even without any use of flash facility.

SLR camera is best for those people who want to enhance their photographic skills and love to capture images from different lenses. These effective cameras are able to let users to provide a properly focused image with a dimmed background to get a different look of the picture. This fantastic camera also allows users with a super fast and effective shot to shot time in which a user can capture an excellent multi shots at a same time.

The ability to change lens to a telescoping lens means the user can zoom in on objects that are further away without disturbing the subject by moving closer. This camera consists of different types of lenses which make easy to photographer to see tiny objects through macro lenses of high quality. The Digital SLR Cameras are regarded best for people who want to do digital photography. However, its size is large than other cameras but they are easy handling devices with simple functioning. Their bulkiness has no bad effect on users and picture quality. The SLR cameras are the best available photography equipment which can capture images in the best way. These high qualities of SLR camera have made them extremely popular and superior devices for better photography experience.

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