Licensed goods refer to regular products produced and sold in China. They can enjoy a national warranty.

Parallel import refers to formal products produced and sold abroad. They can't enjoy the domestic warranty.

There is also that parallel imports generally do not have Chinese.

There is no difference between function and quality. ..

Single lens reflex (SLR) is the most popular viewfinder system, which is used by most 35mm cameras. In this system, the unique design of the mirror and prism enables the photographer to directly observe the image passing through the lens from the viewfinder. Therefore, you can accurately see the same image that the film is about to "see". The core of the system is a movable mirror (as shown in the light blue part), which is placed in front of the film plane at an angle of 45. The light entering the lens (as shown by the red light path) is reflected upward by the mirror to a piece of ground glass. Early SLR cameras had to hold the camera waist-high and look down at the ground glass. Although the image on the ground glass is upright, it is upside down. In order to correct this defect, the current eye-level SLR cameras are equipped with a pentaprism above the frosted glass. This prism reflects light many times to change the light path and send the image to the eyepiece. At this time, the ground image is upright up and down, and corrected left and right. When framing, most of the light entering the camera is reflected upward by the reflector to the pentaprism. Shutters of SLR cameras are almost always directly in front of the film (because they are located in the film plane, they are called focal plane shutters). When framing, the shutter is closed and no light reaches the film. Press the shutter button, the reflector quickly turns up to get out of the way, at the same time, the shutter opens, the light reaches the film, and the shooting is completed. Then, the mirrors in most cameras will be reset immediately.

Interpretation of Several Key Indicators of Digital Camera

First, the aperture

It is expressed by the value of f, because it is reciprocal. The larger the value of f, the smaller the aperture. The maximum aperture of a general digital camera is 2.0, and some models are 1.8 (Olympus C-4040ZOOM).

Simply put, the larger the aperture, the greater the amount of light entering, which has the advantage of maintaining a relatively high shutter speed in low light environment without other auxiliary methods.

Another advantage of a large aperture is that a shallow depth of field can be obtained. Simply put, it can blur things beyond a certain distance in the future, which is generally beneficial when shooting close-ups. So try to choose a larger maximum aperture when choosing. The minimum aperture is usually 8.0, except 1 1 (Panasonic/Lycra DMC-LC 1). Most cameras have little difference. The price of DMC-LC 1 is close to or exceeds the price of an entry-level SLR, so there is not much choice.

B. shutter

Simply put, the shutter is a device used to determine the length of light entering. Generally speaking, the larger the range, the better, but it will not be too big in consumer-grade dc, especially the highest shutter. At present, high-end machines generally need more than 1/2000 seconds, so when choosing, you should pay attention to the slowest speed, and it is best to have door B, which means you can decide the exposure time yourself, and many models also have it.

C, ccd size

We can see that ccd size will be marked in many introductions. Simply put, the ccd size is the size of the photosensitive chip. Generally, the bigger the better, for example, 2/3 is better than11.8 and11.8 is better than 1/2.5. Theoretically, under the same pixel, the larger the ccd size, the less noise it produces, which is reflected in the choice of camera. For example, all cameras are 5 million pixels, one uses a 2/3 ccd and the other uses a11.8 camera. We give priority to 2/3 cameras.

D, optical zoom

Generally speaking, optical zoom is very different from digital zoom. Strictly speaking, digital zoom is of little practical value. When choosing a camera, we should pay attention to the difference between digital zoom and optical zoom multiple. In fact, the emergence of optical zoom lens is to realize the concept of a mirror traveling around the world. Simply put, it is for convenience and wide application. However, the structure of optical zoom lens is usually very complicated and there are a large number of lenses. When the light enters the camera, the more lenses there are, the more refraction times there will be, and the imaging quality will be affected. So generally speaking, the zoom lens of the same level can't compare with the fixed focus lens. However, when ordinary users buy, there are actually few choices in this respect, because it is of little significance to seriously discuss the imaging quality on general consumer-grade dc. Generally, high-power telephoto machines also belong to some high-end machines, which will not do too badly. You can try to choose them.

E, pixel

Pixels play a decisive role in the final print size. The general printing resolution is about 240dpi. What is this concept? Here is a simple algorithm. For example, the maximum resolution of a 5 megapixel camera is generally 2560 x 1, 920, 2560/240, which is approximately equal to 10.6. In other words, a 5-megapixel camera can develop photos with a long side of 10 inch on the premise of ensuring the image quality. So before buying a camera, use this formula to calculate according to your own needs and find the balance point between price and demand. But how to choose dc at the same pixel level? The size of ccd was mentioned earlier. At this time, this size is a key indicator, and a larger ccd size is preferred!

F, ISO value

ISO means sensitivity. The higher the sensitivity, the faster you will feel the light. Therefore, the film with high ISO is also called high-speed film, which is suitable for use in low light environment, such as taking indoor photos and night scenes at home. But the higher the sensitivity, the worse the graininess, and the lower the ISO value, the more delicate the picture will be. In DC, the low ISO value is relatively practical, while the high ISO value is relatively poor in DC at this stage, because the picture displayed by DC high ISO is not only as grainy as traditional film, but also has a lot of color noise, which seriously affects the output picture. Basically, it can be said that in ordinary DC (to distinguish it from digital SLR), ISO higher than 200 is unnecessary (except Fuji's machines), and a few high-end machines. Therefore, in the choice of dc, the key selection point of ISO value is the lowest ISO value, like Canon's DC, which is generally 50, so it is generally felt that the picture of Canon's DC is more delicate. However, this does not mean that you must choose Canon. Many machines have very good pictures at ISO 100, such as Nikon's 5700.

G. About Manual (M)

Manual function used to be the patent of semi-professional machines, but now many cheap DC also have semi-manual or full manual function. At the beginning, the manual function may be too troublesome, but with the deepening of learning, the manual function will become more and more useful. Therefore, when purchasing a machine, the more manual functions, the better.