Monday, September 19, 2011

Understand how a lens image stabilization

Hold the camera has the problem. The lens becomes cloudy turns occur happened. If no image stabilization lens, you may have heard the term "image stabilization" or "vibration reduction" bandied about is with respect to the camera-range, point-and-shoot digital SLR lenses. In this case, we can understand that the IS and VR technology, to deliver a sharp image. But if the technology works and how well? What really happened to make it work? What did not work in situations? Most importantly, you really need?

The first question is yes, image stabilizer technology not only works, it works well. Otherwise, the rest of this article is completely useless. But you should understand what the image stabilization, and if it is used to improve your photos before you go with a couple hundred dollars more for the goals that we have built.

Note: Although the term "stabilization" is often used by writers when it comes to this subject is "vibration reduction" is a term that Nikon uses to the function of the lens itself, which happens also to explain better what is happening to describe. You should consider replacing two things.

To understand how the vibration, we consider briefly the remedial effects. When the camera is portable, and open the shutter for longer than the camera can move in one direction without be pointed, then the resulting image is blurred. What happens is that the lens of the camera tilted upwards, sideways, or a combination of both, focusing on motion picture image sensor location. Focus light is given as a final. The accumulation of all points of light, moving image is blurry pictures.

Clear patch, and move the image sensor with the same number of laps each point of light, so images move lock step with image sensors. Some camera manufacturers implement the right solution, the float image sensor, so you can see the picture when the camera moves during the exposure. But this is more the exception than the rule. A typical solution is obtained by adding a vibration reduction lens, not the camera body.

So, how does it work? In fact, very easy to understand. Contains, instead of a floating image sensor, the body of the lens with liquid lens. Position of the lenses is controlled by the engine, combined with sensors that detect the amount of the lens body rotates vertically or horizontally during exposure.

If the body rotates toward the ultimate goal, says compensation sensor, the motor lens "to keep a little liquid into the beam of light through the lens. If the body to the left lens is rotated to compensate for the lens, turn right. The end result is that the image retains its position on the image sensor during the exposure creates a sharper image than if the vibration reduction system is disabled (who can).

It may seem strange that the system is the movement of the camera track as well. In fact, it's amazing, but it works because the camera movement monitored approximately every 1/1000th of a second while the camera's movement is done on the time scale of, say, 1/30th, 1/15th or even 1 / 4 seconds.

Sellers these objectives, image stabilization technology, you have 3 or 4 stops to can your risk. This means that if for specific shooting situations, handheld shutter speed of the slowest time generated images 1/125th second, okay, so with the addition of vibration, it should be possible to maybe 1 / 8 or 1/15th sec shoot. This is a big problem if you turn in the shade or in low light conditions had, or do you need to close the aperture to increase depth of field.

But image stabilization is only in the range of shutter speeds that are too large or too small. If you try to second-hand exposure shall be preserved, VR compensation was not in a position of unusual movements, you compete. Likewise, if you are 1/500th second or more to shoot, the camera will be able to experience the shock, and therefore the VR system is, however, no improvement.

One thing about the reduction of vibrations that are necessary, to compensate for camera movement during exposure to remember. It's not about the speed of the object you are trying to photograph. Then the fast ball is still foggy, if you do not tackle 1/500th seconds.

You have IS or VR lenses to improve your photography? It is fairly easy to answer. If you are found regularly shoot at speeds less than 1/250th of a second, then chances are we can get rid of a large number of them, or contrast, blurred shot of the VR lens good investment. Even better, if you buy your next digital camera, simply point-and-shoot with a built-in image stabilizer, or if you buy a digital SLR, try to get a model with built-in image stabilizer lens ever.
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