Zoom Lens With DSLRs May Offer a Surprise

If you are shopping around for your first ever DSLR camera, then there is one factor that you might want to learn about and that is the "crop factor." The reason that this feature is important is that it might give you a different lens performance than you expect. When it comes to compact digital cameras, what you see is that you get and if the compact camera comes with a 35mm equivalent lens, then you would get the same performance as a 35mm lens. However, this is not necessarily true in the case of DSLR cameras.

The sensors of most DSLR cameras is smaller than a 35mm film and a camera with 1.5, 1.6, or 2.0 crop factor will capture smaller area and "crop" the view. If you use a lens with 100mm focal length and the camera has a 1.5 crop factor, then the final, adjusted focal length would be 150mm. The photographers that are likely to take more indoor or landscape photos are the ones that should be typically concerned with the crop factor or at least take it into account when buying lenses for their DSLRs. However, if you take more wildlife, portrait, or macro shots, then you might not have to worry about this issue at all. One way to work around it though, is to purchase a DSLR that has a zero crop factor, or a full-frame DLSR. These cameras typically cost more and depending on your needs, purchasing one might not be justified at all.

Another fact that is good to know is that all camera manufacturers use a consistent crop factor for their cameras and therefore the number does not vary from one camera model to another within the same brand. The terms focal length multiplier and focal length conversion factor are often used instead of "crop factor" and the most common numbers are 1.5x, used by Nikon and Sony, 1.6x, used by Canon, and 2.0x, used by Olympus.

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Factors to Consider When Buying a Camera Lens

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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Important Spy Camera Pieces

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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