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Slr Lens
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SLR stands for Digital Single lens Reflex. An SLR camera's viewfinder has the capability to have direct light during shoots. The location of the mirror inside the digital camera enables such a feature. This process enables the viewfinder to create pentaprism. Pentaprism aids in placing the image in the right angle on your screen. The best digital SLR camera would help you in finding the right angle for you.

What's best about digital SLRs?

SLR digital cameras have an extensive scope of focal length of lens. This means that you would not need to buy costly lenses required for different kinds of photography. A lot of photo enthusiasts find the SLR cameras as the best digital cameras. The mentioned feature of SLRs allows photographers to stick to a single lens which results to speedier work.

The high-end models of digital SLRs are equipped with a Live view mode. With the use of LCD, you can put together your images. Prism will redirect the image to small sensor that delivers to the camera's LCD. And because SLRs have contrast autofocus, manual focusing won't be a need.

What are the kinds of digital SLRs?

There are three kinds of digital SLR.

1.Interchangeable-lens full system digital SLR- With this kind, you have the option to buy and change your lenses the way you like it. You can get a supertelefoto or super bid angle. It depends on your pocket and your usage. You must remember that brands must go together. The brand of your camera should also be the brand of the lenses you would purchase. The Nikon D300 is just one brand for this kind of digital SLR

2.Fixed lens digital - The lenses of these SLRs are permanent. The adaptability is also limited. However, you can be sure that this digital camera will be dust free forever. You can add some gadgets like a non-moving mirror to enable your viewfinder to get some light thru a sensor. The Olympus E-20N carries this kind of fixed lens digital SLR camera.

3.SLR-like or SLR-style- This is the normal digital camera that uses an electronic viewfinder (EVF) that is usually a small LCD in lieu of the pentaprism of SLRs. One of the feature of this style is the tremendous long zoom lenses that are often referred to as megazooms. The Canon PowerShot S51S is one brand that carries this type of camera.

Getting the perfect camera, is never an easy thing, especially with the way digital technology is constantly changing. Fortunately, there are plenty of helpful websites online, that can narrow down your search and help you find the camera with all the features important to you.

Digital Single Lens Reflex Cameras Today

Single lens reflex cameras are advanced, high-end cameras favored by professional photographers and amateur enthusiasts. Such photographers gravitate toward SLR cameras because they are faster, take more precise photographs, and are more adaptable.

Have you ever used a film camera and noticed that photo you took is slightly off-center from the image you framed through the viewfinder, especially on close-up shots? This happens because one cannot look through the actual lens of the camera-the shutter and film (or in the case of digital cameras, the image sensor) are in the way. Thus, the viewfinder is off to the side of the actual camera lens, resulting in two slightly different angles of view.

SLR cameras fix this problem by using mirrors and prisms to let the photographer see through the camera lens. It achieves this by lowering a mirror into the lens box. The mirror reflects the image coming through the lens upward into a prism, which in turn bounces the image into the viewfinder. This way, the photographer is able to see exactly what the camera lens is seeing, with the exception of the brief instant when the photograph is being taken.

At this point, the mirror flips up out of the way of the lens box. The shutter opens, exposing the film or image sensor to the light coming through the lens. The picture is captured, the shutter closes, the mirror drops back down, and the photographer can once again see through the viewfinder.

The introduction of digital "point and shoot" cameras changed the game slightly. They also allow the photographer to see exactly what the lens is seeing. They have limitations, however, that some professional photographers feel make them unusable. The main drawback of commercial digital cameras is a considerable lag time between when the photographer pushes the button and when the camera actually captures the image. During these seconds, the camera may be jostled, the angle change, the lens shift out of focus, or the subject being photographed may move. Although perfectly fine for still pictures, photographers who need to capture an image instantly, such as sports, action, or wildlife photographers, the lag time is unacceptable.

A new generation of Digital SLR cameras (DSLR) combine the best of both technologies. They use the SLR mirror system to allow the photographer to see exactly what the lens sees. Simply by replacing the film behind the shutter with a digital light image sensor instead, a DSLR camera is still able to capture images instantly. In this way, a DSLR camera combines the accuracy and speed of an SLR camera with the convenience of digital cameras.

As DSLR cameras are usually high-end machines intended for a professional market, they tend to be more expensive, but also incorporate other advanced features. An average DSLR camera usually includes auto focus options, live preview, electronic flash controls, the ability to swap specialized lenses, and electronic adjustment of the captured digital image, such as optimizing the contrast and color, red-eye correction, and monochrome options, among many others. DSLR cameras also generally have a larger digital image sensor, providing better quality images with a higher pixel resolution, lower noise, and a superior color range. While the price of DSLR cameras make them a financial investment, professional photographers and amateur enthusiasts will consider it well worth it.

About the Author

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How do I clean my SLR lens without leaving streaks?

After doing some research on how to clean an SLR lens, I found that the most common suggestion is to use hot breath and a microfiber cloth to clean the lens in a circular motion. This appeared to work at first. However, after careful inspection, very slight streaks were visible when the lens was viewed underneath sunlight or a bright halogen lamp. In other conditions, these streaks are not visible. The picture quality does not seem to be affected, but I can't help thinking that there has to be at least some picture degradation due to these streaks. Am I being a obsessive? Is there any way to remove these streaks? I just purchased this camera a week ago (a Nikon D40 with lens) and I want to keep it in pristine condition for as long as possible.

I am thinking that the streaks are due to a dirty microfiber cloth. Would washing the cloth be a good idea? If so, what should I clean it with? What should I avoid cleaning it with?

Clean with the micro fiber cloth. Or get one from an optometrist. Never ever clean your lenses with any kind of liquid or hot breath. Unless there is a streak of some kind and the cloth isn't good enough. Then and only then you would use lens cleaner. You pour it on the cloth and wipe, never on the lens.
Otherwise, liquid can seep into the lens under the glass and settle there. It can allow for bacteria and algae to grow and ruin your lens.

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