Camera Lens, Canon, Canon EF 75-300mm f/4-5.6 III USM Telephoto Zoom , 6472A002
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.
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When shopping for a Digital SLR Camera people often overlook or skimp on the camera's lenses. Camera Lenses serve as the digital SLR cameras "eye," the lens determines what and how your camera will see your subject and how well that view is transmitted to the camera's sensor chip for recording. The way I like to look at camera lenses is as painter's brushes, broad strokes, medium stokes, all purpose brushes, and small detail brushes. There is a lot to learn about digital slr camera lenses and this article will serve as a basic outline to understanding them. The following sections explain the basic types of digital SLR camera lenses, how they work, and how to select them.
Focal Length
On a digital SLR camera the focal length of the lenses measures the distance between the lens and the image sensor, measured in millimeters. Lenses can be classified into subgroups like prime, macro, wide angle, normal, telephoto, and zoom lenses. They are also rated in regards to f-stop or speed an example would be a F2.0 50mm lens or a 1.4F 80mm lens. We will explain this later in this article.
Prime Lenses:
Prime lenses are fixed focal length lenses like a 50mm 1.4f lens. To zoom with these types of lenses you need to use your feet and to get closer or farther away from the subject. Traditionally prime lenses are sharper and faster then zoom lenses. If you are on a budget you can pick up some amazing used older prime lenses off eBay or your local camera store.
Macro Lenses:
Macro Lenses are your detail brushes they enable you to get up close and personal with your subject. These types of lenses are used for extreme close ups on small objects like daisies, pennies, and food but not limited to these types of subjects. Examples of macro lenses are 50mm and 100mm macros. These lenses are also great for selective focus types of photos.
Wide-angle Lenses:
Wide-angle lenses are your broad stroke brushes; these types of lenses have short focal lengths. The short focal length has the visual effect of "pushing" the subject away from you and making it appear smaller. The beauty of wide-angle lenses is you can be relatively close to your subject and fit a broad stroke of the background into the scene.
One problem with wide-angle lenses is known as convergence, a distortion that makes vertical structures appear to lean toward the center of the frame. A way to check if the wide-angle lenses you are interested in has convergence is to take test pictures before buying the lens. With high quality wide angles lenses like Canon L series lenses address this convergence issue well. Examples of wide-angle lenses are 15MM, 17mm, 24mm and 28mm lenses.
Normal Lenses:
Normal Lenses try to mimic how the human eye sees and are some of the most versatile lenses you can use. These are my all purpose brushes, and are somewhere between a wide angle and a telephoto lenses. If you buy just one lens try and buy the fastest normal lenses you can like a 50mm 1.4f lenses. Some examples of normal lenses are 35mm; 50mm, 65mm and some consider a 80mm a normal lens.
Telephoto Lenses:
Lenses with long focal lengths 100mm and higher are called telephoto lenses. A long focal length seems to bring the subject closer to you and increases the subject's size in the frame. Telephoto lenses also give your subjects a graphic look and flatten out your subject. These lenses are my short stroke brushes.
Zoom Lenses:
Zoom lenses are special because they can be very versatile. These types of lenses vary in their focal lengths and come in many in wide-angle, telephoto, and wide-angle to telephoto. In my bag I carry a 17mm to 35mm my wide-angle broad brush, 24mm to 70mm my medium brush, and a 80mm to 200mm my short brush. With these three lenses I get a very board range of focal lengths for any situation. All of my zooms are at least f2.8 through out the lenses range, which means my f-stop can stay constant while I am zooming in and out. These types of lenses are very expensive but so get what you pay for. When shopping for a zoom lenses check out the f-stop range rating. An example is a 24mm to 300mm f3.5-f5.6 lenses meaning the lowest f-stop you can shoot is at the 24mm range of the lenses and when you zoom to 200mm the lowest you can go is f5.6. Zoom lenses can give you flexibility and versatility all in one lenses. When buying a zoom lens try and get one that is made of glass and is the fastest you can afford, you will not regret it.
Understanding what these different groups of lenses can do will help you make more informed decisions on what lenses to purchase and what to put in your camera bag.
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| Price : $228.60CANON 6473A003 EF75-300 TELEPHOTO ZOOM LENS
COMPATIBLE WITH CANON EOS CAMERAS
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| Price : | Post Date : Aug 12, 2011 00:15:07
This package includes all of the following items:
1. Vivitar 650-1300mm Telephoto Zoom Lens for Canon
2. Vivitar Series 1 Carrying Case
3. UV Filter
4. CPL Filter
5. 72" Monopod
6. T-Mount Adapter
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The Opteka 650-1300mm high definition super telephoto zoom lens is perfect for the professional and amateur photographer alike. There is a built-in, rotating tripod mount for easily attaching to your tripod or monopod. It's an extremely powerful telephoto zoom lens with the versatility that you need. This lens is great for the wildlife or nature photographer who wants to be hidden while taking photos of the subject. Advances in ultra high-index / low-dispersion optical glasses, new barrel materials, and exotic anti-reflection coatings, along with the latest in computer-aided-design / computer-aided-manufacturing), are combined to produce lenses of unprecedented quality. Diamond-cut from crystal-clear, water-white optical glass, Opteka lenses are ground and polished to a precise precision.This product is designed for Canon EOS/ AF.For a complete compatibility list please refer to the original manufacturer's web site.
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| Price : $169.00This 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.
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