Wednesday, April 13, 2011

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Tuesday, April 12, 2011

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Sunday, April 10, 2011

ISO common card machine to buy really does not matter

When buying a digital camera olympus li-42b battery , there are several performance indicators are buyers are concerned, than such as ISO ( light sensitivity ) is one of them. Many people think that, ISO higher the value, DC, the better, in fact, this view is wrong. Indeed, for the SLR, this parameter is more important, but for the average card machine is concerned, ISO is not everything. In the traditional film camera ISO representative of sensitivity criteria, in the digital camera ISO definitions and the same film, on behalf of the photographic image sensor speed.ISO higher values ??to illustrate the ability of light-sensitive photographic material, the stronger.ISO is calculated as S = 0.8 / H (S sensitivity , H for the exposure.) We can see from the formula, speed the higher the demands on the less exposure.ISO 200 speed film of the light-sensitive ISO 100 twice, in other words, other things being equal, ISO 200 film exposure is required for ISO 100 film in half. In the digital camera by adjusting the equivalent sensitivity of the size, number and picture can change the brightness of light values. Therefore, the sensitivity has become an indirect control of image brightness values, and of course this can also be used to control the required exposure. Relatively ISO higher the value, the stronger the light recording capability, but along with the ISO value increases, the image noise will inevitably increase.ISO the lower the value, you need a larger aperture, or need a longer shutter time, but the resulting image will be less noise, image quality can be better. Therefore, the strength of some technology companies will emphasize the selling points of your card is DC with a wide ISO range, which means either a digital camera olympus li-50b battery this card at low ISO values ??to obtain high quality images, while at high ISO situations, they can shot record clear images. High ISO shooting ability, for the case in poor light (such as indoor artificial light source) of the photo shoot, or very practical. Can guarantee the clarity of the overall picture, increase the shutter speed, it is still seen as an indirect anti-shake technology. But the high value of the ISO noise case is unlikely to be remedied, so commonly used by manufacturers to reduce noise post-algorithm processing, and this process is known as noise reduction, but the noise caused by the negative impact is the largest loss of picture detail, while the high value of the ISO under the camera's automatic white balance, metering and other features may also be some deviation, the highest value in the ISO , the want to get better picture quality is very difficult, and in fact digital card camera image sensor and very difficult to achieve a better performance of tolerance, no matter how good even if the effect of noise reduction, and that they can not achieve perfection. Therefore, the card machine is concerned, speed can reach 800 as long as enough is already completely, and then another job it is tasteless.olympus li-60b battery

Friday, April 8, 2011

How to determine the appropriate exposure

AE

Now, all of the stupid camera CANON Digital Camera Battery and the vast majority of single-lens reflex camera (SLR) have an auto exposure (AE) of the available features. In theory, we have to do all the work is the lens at the subject matter, and press the shutter button. Built-in light meter will complete the remaining work, regardless of the color film or black and white film, it will automatically calculate the "correct" exposure. This seems to look perfect, but unfortunately the built-in light meter that "correct" exposure is often wrong!

Why? Because the light meter does not think, only we think. We want to correct the subject's face exposure, or do you want to only show the contours of the face and exposure for the sky to catch the beautiful sunset while it? AE metering system can only guess is that we want to get the object, no matter how complex metering system, it is impossible to know what we want.

While we ourselves know what we want to do. This lesson will learn how to use the camera's built-in metering system and a separate light meter to ensure that every time we need to get exposure. We do not guess, but do not know.

The type of metering system

Basically, there are three different types of metering systems, we can find their own way out of its use.

First of all, you can use the automatic metering system. Such systems are generally used in the fool the camera, it can automatically do it all. We do not have any control of the exposure, the camera will complete all the work, but it does not matter right or wrong. If our camera and metering system is fully automated, without any control of our exposure, then they want us to do? Perhaps we can do nothing on the exposure control, and yet not be overly pessimistic. This lesson we will introduce some techniques, the use of these skills can "fool" the camera, and thus exert some control over exposure.

Second, we can use the metering system with built-in camera, it allows us to conduct a manual exposure control. Many cameras have auto exposure to manually override by a known way to achieve this function, that is, turn off the automatic metering system, and manual exposure control.

Most SLR cameras CANON NB-3L Battery offer a "model" option, which we can set the camera for a variety of different automatic exposure modes, you can also set it to manual mode, the exposure to full human control. Whether using a manual override or manual mode, the result is the same, that is, to impose artificial control of exposure. A third possibility is to use a separate handheld light meter, as shown in Figure 5.2. If we do not built-in camera light meter, you can use this separate light meter. Or we can use it to supplement the built-in light meter to get the data.

Regardless of the type of light meter, but also whether to take a color film or black and white film, the basic principle behind its operation is similar. There are two basic types of metering systems:

1. Reflected light exposure meter

2. Incident light meter

What is the reflected light exposure meter

Reflected light meter is more common to use all the built-in light meter are this type. The meter is the object of the reflected light is measured. When the lens at the subject at the same time, it will be the face of optoelectronic components of the subject.

The alignment meter, the brighter the subject matter, which gives the higher readings; are aligned, the brighter the subject matter, which gives lower readings. If the meter object aligned with a mixture of the composition of light and dark scenes, it gives the average brightness of the whole scene, whether it is to take a color film or black and white film, readings are the same.

Theoretically, we may we are interested in the subject is arranged near the center of the photo CANON NB-2L Battery , so some of the built-in camera light meter will be more concerned about the image near the center of the reflected light, and more less attention to objects near the edge of the reflected light. The meter is the center of focus for metering, that is, they produce a reading of all light in the scene based on the strength of the center of the light is particularly emphasized (weighted) and obtained.

Another type of reflected light meter is a spot light meter. The meter reads a very narrow region of light - may be only a twice wide. As the name implies, can point to the spot meter and read a very small spot. Therefore, some SLR's CANON NB-1L Battery built-in light meter that offers a choice of local metering function.

Today, many of the most complex camera offers a feature called Matrix metering. In fact, these cameras is the frame into different intervals, such as a central range and angle of the individual interval. Meter "reads" the light in each section, and the information is fed into computer chips, the chip is given in the light of each interval, and the information is fed into computer chips, the chips are given for each reading " value "and ultimately determine the" correct "exposure. However, this meter is still only guess our intention, as we mentioned in the previous example: we want to correct exposure is the subject's face or sunset when the sky? Meter can not make decisions for us.CANON NB-6L Battery

What is the incident light meter

The incident light and reflected light meter light meter is different from the camera CANON NB-5L Battery position is not to point the subject is, but from the subject is at the point the camera. The result is exposure to light the subject is on the light meter will fall on the same token, this is the light that we are measuring. We do not measure the subject brightness value of the object itself, but the measure fell on the subject is on the light. Meter designed to indicate the correct exposure required for exposure, and assume that the scene from clear to dark tones, the average range.

Should use what type of light meter

Incident light meter in the professional photography has a special value, for example, used to balance studio lighting. Now, we recommend using the light meter is the type of reflected light. Remember, the camera's built into us as the reflected light meter light meter, so we can safely use, as long as we understand it the flexibility to use it.CANON NB-4L Battery

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Wednesday, April 6, 2011

JVC GR-D250 Camcorder Review - MiniDV - CamcorderInf

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