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Purchasing a DSLR or Digital Single Lens Reflex camera comes with a basic kit lens that could give decent quality pictures. But the advantage in DSLR cameras is being able to switch lenses, depending on the type of shot you want. There are powerful zoom lenses or macro lenses, for example.
Here are some factors to consider when buying a digital camera lens:
The Glass
o Focal Length - It is the actual distance in-between the focal lane of the lens and the rear element, measured in millimeters (mm). This is where the light's parallel beams enter the lens converging onto a point. It determines the viewing angle of the lens. When there is a shorter focal length, the field of view becomes wider, providing more scenes for your camera to capture. When you increase the focal length, the actual field of view becomes narrower.
o Aperture - It is one of the mechanisms that control the actual "amount of light" passing through the lens towards the image sensors. It is also referred as "f-stops," like f/2/8. The smaller the number, the larger the opening. This means more light enters the camera. Since it begins to collect additional light, a type of lens that allows you to open to a wider aperture also enables you to have a faster shutter speed. Such feature is essential in low lighting conditions to obtain sharp images, especially through a handheld camera.
o Image Stabilization - Slower shutter speed can result to blurry photos when cameras are handheld. Image stabilization counteracts the shaking, allowing one to shoot certain handheld shots amidst low lighting conditions. Canon's term for this is IS (Image Stabilization). Nikon use the term VR (Vibration Reduction).
Zoom lenses included in a variety of DSLR kits offer focal lengths ranging from 18 to 35mm. Depending on the cropping capability of the camera, it can reach up to 55mm. This means that you can go from only a moderate "wide-angle" view towards a so-called "slight telephoto."
If you have plans of expanding your digital camera's features, here are some things you need to consider:
o Prime Lenses - These should possess a longer type of zoom lens or a lone focal length between 35mm up to 85mm. Prime lenses have a better glass on them.
If you get the "fixed-length lens", there is a tendency that you will be required to move around when getting your shot. Of course, over a certain time, this will already help you make better compositions. Prime lenses also possess a wider type of maximum aperture, making it easier to get sharper shots, especially under low lighting.
o Zoom Lenses - For those wishing to get action photos, the best would be the "telephoto lens" which ranges from 100mm up to 300mm. This is due to the DSLRs crop factor. There is not much zooming needed. A good example would be Nikon D40 which has a 200mm type of telephoto lens that can turn into a 300mm one.
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A spy camera is a complicated piece of equipment that's actually quite easy to explain. A camera lens transmits images to a receiver which then broadcasts those images on a TV screen, monitor or even on a personal computer. And while inside each component of your nanny camera is a complex section of wires and circuits, it's those two important units that make your nanny camera what it is. Without them - and without having them function properly, your micro spy nanny cam will simply be a high-tech piece of junk that won't actually do anything that you want it to.
So, we've determined that the camera and the receiver are the most vital components of a spy cam. Let's elaborate on those pieces so that you can enjoy a better understanding of exactly what they do, how they work and how they contribute to enhancing the safety and security of your family, home or business location.
Camera Lens
This is your eye when you can't be there to watch and see for yourself. The camera is the part that actually catches and records everything that happens within its field of vision. The great thing about the camera lens is that they can be incredibly small in size. There are exceptionally small camera lenses - called pinhole lenses - which are literally less than 1" in diameter. With spy cams, it's important to always understand that the camera lens is your window to everything that's going on. Without it, you won't see anything and your nanny camera won't record anything.
That's why pinhole camera lenses are so valuable. You can place them just about anywhere and not have to worry about anyone locating it or detecting it. Remember, the camera lens has to be in some clear location where it can have an unobstructed view. An exceptionally large camera lens will be easily discovered, thus neutralizing the "hidden" aspect of the spy camera. But, a small lens can be placed in any room and nobody will ever know that it's there.
There's one truth to always remember when it comes to spy cameras and the behavior of people: when people know that they are being watched, they will modify their behavior to make themselves appear in a favorable light. When they think they're alone is when their true behavior and intentions come to the forefront. A well hidden camera lens will always capture and record the truth, because nobody will know that it's there.
Receiver
Just as important as the camera lens is the video receiver. When you're super-small pinhole lens is recording video, it's got to send that video information somewhere. That somewhere is the receiver. For a majority of spy cameras and nanny cams, the receiver plug into a standard wall outlet. At the same time, the receiver is also connected to a TV, computer screen or viewing monitor. This allows you to watch the video that your camera is recording - in real time - directly on your television set.
The reason that this part is important is quite obvious actually: without it, you couldn't see what your camera recorded. Many people, when they use a spy camera, they intend to watch the footage that the nanny cam captured while they were away at a later time. Without a reliable, strong receiver, your camera won't be able to transmit any image whatsoever, thus rendering it completely and utterly useless. You should always endeavor to ensure that your camera receiver is kept in pristine condition at all times.
Your receiver will always be in tune with your camera lens, which means that you'll be able to set them up so that they'll always work together. Cameras and receivers are designed to work in conjunction with each other, and they aren't designed to be mixed and matched with other spy cam products or brands.
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It may be time to consider a single new lens that will handle more of your photography needs. Granted, there are many wonderful lenses available for each different DSLR, and when you have time to think about and set up your shot, you should reach into your camera bag and get that special lens that will handle the shot to perfection.
Prime lenses are considered by many photographers to be the best quality you can buy. And if your budget allows, you can fill up your bag with the best glass that money can buy. But even then, you will want to have a great all purpose lens so you can take quick action when necessary.
Here are a few things to consider:
Image Quality - this is always the first consideration when choosing a lens. If all the other factors are tops, but the final photo is not clear and sharp, you may as well leave your wallet in your pocket. Image quality is king when it comes to choosing a camera, lens, or any peripheral camera equipment.
Glass - the quality and treatment of the glass used to manufacture the lens is of great importance. Manufacturing technology has advanced greatly over the past few years. Now there are special techniques and coatings that will eliminate distortion, lens flare, and other things that cause deterioration of digital images.
Build quality - some lenses are just built better than others... better materials and better glass. Cheaper lenses may use plastic parts that break more easily.
Focal Length - for an all purpose lens, you will want a greater focal range. 18mm at the short end is optimal to get the landscapes and wide angle interior shots. And now that there are better manufacturing methods, you can get good lenses with 12x or greater zoom, so that the long end would be 200-270mm with still good image quality.
Image Stabilization - lenses with built in image stabilization (or optical stabilization) make it possible to hand hold your camera in low light and still great sharp shots. Without image stabilization, you will be much more dependent upon your tripod.
Cost - there is an extremely wide range of costs when selecting a walk around lens. The kit lenses will be your least expensive, however, kit lenses do not meet all the other criteria mentioned above. You should plan on spending $500 or more for a good quality all purpose walk around lens. You should also look into manufacturers other than your camera maker. Sigma, Tamron, and Tokina make some excellent lenses that fit on Canon, Nikon, Pentax, and Sony.
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