Speed Sensor

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Speed Sensor
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Overexposure is a term often discussed in photography. What does it mean?

Simply put, it is when too much light is allowed to reach the sensor and the resulting image is too "light" or "bright".

Why does it happen?

To get a decent image, the camera has to select a combination of aperture (the size of the hole in the lens that lets in light) and shutter speed (the length of time the sensor is exposed to the light when taking a picture).

Generally, the camera chooses the correct combination. Sometimes the camera makes a wrong judgement for the scene in front of it OR the photographer chooses settings that are not ideal.

If this happens, too much light can enter the camera and hit the sensor, resulting in overexposure. The "whites" or "highlights" will be burnt out and too bright. Any detail in these areas will tend to be lost.

The cure is to retake the photograph and choose LESS exposure by using a smaller aperture or a faster shutter speed. This can be done either manually by the photographer or automatically by the camera if it has facility for "automatic exposure compensation". Read the manual to find out.

Your images might also be overexposed if there is a good deal of low light in the scene you are photographing as the camera tries to compensate for the average low light levels by increasing the light hitting the sensor. Alternatively, using flash, especially the in-built flash on compacts and lower end prosumers / SLRs can result in overexposure and "bleaching" of your subjects. In these cases try to compensate using the camera.

Eric Hartwell runs the photography resource site http://www.theshutter.co.uk and the associated discussion forums as well as the regular weblog at http://thephotographysite.blogspot.com.

Why Does Your Car Need a Vehicle Speed Sensor?

You could be wondering why precisely your auto requires a car speed sensor. Obviously knowing how swiftly you are going is critical, but how exactly is this info used and why is it essential? Find out for yourself the power of the vehicle speed sensor under.

A vehicle speed sensor is basically far more complex than what you'll have realized. Today's sensors essentially make the automobiles you drive safer and protect the passengers from a variety of perils, by acting in techniques and at speeds that humans simply cannot do.

The first invention with the vehicle speed sensor came in the antilock brake systems, or ABS, which we all now know about. By capitalizing on magnetic and electric currents, the rate of the wheels may be more accurately and quickly gauged compared to older strategies.

Moving on in our glance at the car speed sensor from antilock brakes, next up are traction control systems. Traction control systems were a natural development from ABS, and they have the added power of being able to compare and adjust for the velocity of the driven wheels from the rate of the wheels on the other axis.

The power of antilock brakes and traction control have made autos over the last decade or 2 significantly more safe than they were formerly. Having the power of a vehicle speed sensor in all vehicles has saved many lives, and now manufacturers have been taking things a step further.

The latest technology is a total electronic stability control system. This type of system builds on these technologies for a much more complete vehicle speed sensor. Actually, multiple sensors are employed in the wheels, the steering wheel, the brakes and the throttle to paint a total picture of a vehicle's performance and your reactions in all situations.

Thus if you're taking a turn too sharply or hit a slick spit, all of these factors are instantly computed and a reaction is right away put into effect, saving many accidents from ever going down. Early reports have shown this application of the vehicle speed sensor has reduced serious injuries from single car collisions by as much as 50%.

While many of us feel that a car speed sensor stability system should now be imperative, they aren't yet. However, in some regions to have a five star safety rating the car must use a vehicle speed sensor system in this way. If you're looking for the most in security for you and your family, purchase a automobile that features this sort of safety.

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Which speed sensor controls the speed indicator on dash?

I need to know exactly which speed sensor to replace because my '99 corolla's speed indicator is not working.

That would be the VSS.

Hands On: Sony's NEX-5 Small Interchangeable-Lens Camera
In February, Sony announced plans to create an entirely new camera, one with interchangeable lenses that can produce DSLR-quality images, HD video and near DSLR speed but from a body that's the size of a compact point-and-shoot. Those cameras are the new Sony NEX-3 and NEX-5.

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