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