Tuesday, January 24, 2012

Canon EF-S 55-250mm f/4.0-5.6 IS Telephoto Zoom Lens for Canon Digital SLR Cameras

!±8± Canon EF-S 55-250mm f/4.0-5.6 IS Telephoto Zoom Lens for Canon Digital SLR Cameras

Brand : Canon | Rate : | Price : $219.00
Post Date : Jan 24, 2012 22:38:28 | Usually ships in 1-2 business days

This telephoto zoom lens is designed with Canon's Optical Image Stabilizer technology while retaining compactness and lightness, in response to demands of photographers. This high zoom ratio lens is equivalent to a focal length of 88-400mm in the 35mm format (when used on Canon EOS cameras compatible with EF-S lenses), and the image stabilizer effect equivalent to a shutter speed about 4 stops faster than the same size lens without Image Stabilizer. In other words, if the slowest shutter speed you could formerly hold a 250mm lens steadily was 1/250th of a second, with Canon's 4-stop stabilization correction, you could hand-hold at shutter speeds as slow as 1/15th of a second. It also uses a UD-glass lens element to correct chromatic aberration for excellent image quality throughout the zoom range. This new EF-S telephoto lens with great features delivers excellent performance at an affordable price for all photographers.

  • Focal Length & Maximum Aperture: 55-250mm F/4-5.6
  • 12 Elements In 10 Groups, Including One UD-glass Element
  • Focus Adjustment: DC Motor, Gear-driven(front Focusing Design)
  • Closest Focusing Distance: 3.6 Ft./1.1m

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Wednesday, November 23, 2011

Canon EF 75-300mm f/4-5.6 III USM Telephoto Zoom Lens for Canon SLR Cameras

!±8±Canon EF 75-300mm f/4-5.6 III USM Telephoto Zoom Lens for Canon SLR Cameras

Brand : Canon
Rate :
Price : $179.00
Post Date : Nov 23, 2011 11:05:26
Usually ships in 24 hours



Camera Lens, Canon, Canon EF 75-300mm f/4-5.6 III USM Telephoto Zoom , 6472A002

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Friday, November 18, 2011

Step by Step Method on How a DSLR Camera Works

!±8± Step by Step Method on How a DSLR Camera Works

I just wrote this article for those people who are wondering how a DSLR camera works and why it is more superior to a typical digital camera (point-and-shoot camera.) In this article, I listed the things that made the DSLR unique. Here they are:

Lens

A picture captured using a DSLR camera begins on the lens. DSLR lens is a variety of sub-lenses known as elements. Each lens refines and centers light to produce a high quality photograph. Lenses on Digital SLRs may be replaced for several functions. Wide angle camera lenses may be used intended for scenery. Long telephoto camera lenses may be used for sports or wildlife photography. Zoom lenses that adjust their focal length among telephoto and wide-angle are really typical, and they are usually incorporated with the digital camera.

Viewfinder, Mirror and Prism

DSLR camera is special because of their pentaprism and mirror. A mirror at the rear of the lens echoes the light towards a 5-sided prism, in which its mirrored in the viewfinder. If the shutter is pushed, the mirror at the rear of the lens turns up in order to allow a straight course between the shutter and the light. The shutter opens up for the necessary period, and the light comes in towards the sensor. In DSLRs, what a digital photographer sees in the viewfinder is almost what is taken by the sensor.

Shutter and Aperture

In DSLR, the shutter is situated in between the flip-up mirror and sensor as well as the aperture is located in the camera lens. The aperture controls by contracting and expanding, the level of light passing to the lens. The shutter regulates the quantity of light dropping to the sensor through leaving it open for a certain quantity of time. The aperture and shutter operate with each other to let an accurate quantity of light to come to the sensor.

Sensor

The camera sensor is actually a matrix of small units which measure the strength and colour of the light able to come to the sensor by your shutter. These units are known as sensor sites, and they are made up of a little lens, analog to digital converter and a signal amplifier. The caliber of the ultimate picture is mainly one factor of sensor quality.

In-Camera Processing

As soon as the picture has been taken with the sensor and converted to digital, fundamental picture processing is performed inside the camera. This might consist of eliminating noise and grain normal while in the sensor, modifying levels to user preference, along with other basic things that do not call for the potential of your PC. More contemporary DSLRs have more impressive computers that enable more complicated in-camera developing such as changing a picture from colored to monochrome.

Memory Card

After picture developing, the graphic is saved over a memory card for future access through computers. Flash memory is utilized since it does not need capacity to save a picture. Typical memory cards are SD, XD and Compact Flash. After a picture is on the storage device, it could be read by every computer having a proper card reader. Many DSLRs make use of Compact Flash or SD card.


Step by Step Method on How a DSLR Camera Works

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