What should I pay attention to when buying second-hand cameras?

? In the second-hand camera market, you may find a lot of good goods, and friends who know the goods can often return home with full loads. Friends who don't know the goods can not only buy good goods, but also be cheated. It can be seen that buying a second-hand camera also requires experience and skills. So what? 1, depending on the appearance: First, whether there are bumps, cracks and scratches on the appearance. From these points, we can judge the use status of the original holder. Ordinary professionals, due to the large number of equipment and frequent use, usually place the equipment at will, which is prone to friction and collision, so there will be many obvious traces on the camera surface, so they should be psychologically prepared when buying. This machine may have been used many times. Of course, some cameras are prone to cracks because they are plastic bodies, especially next to buttons, dials and function key screws, which is caused by quality problems. In addition, it depends on whether the screws used are consistent and whether there are obvious signs of inconsistency. 2, look at the viewfinder, reflector, lens holder: these three points can also see the degree of use of the camera. Check that the viewfinder is clean, scratch-free and well maintained. See if there are any obvious marks on the lens holder. Professionals frequently change lenses, and the traces will be heavy. Moreover, the general cinematographers are all one machine at a time, and they change little or not. Of course, the number of photos will be greatly reduced. Another thing to look at is the reflector, which is the same as the lens holder. Less times to take off the mirror, naturally new and clean. On the contrary, dust will increase, especially some rubbed reflectors, which will have obvious traces. Such a camera should also be cautious. Another way to check the number of photos is to open the back cover. See if the film box is clean. If it is dirty and dusty, it means it has been used many times. On the contrary, it is rarely used. You must look at the flat plate to see if there are any scratches on the film. Of course, this is not suitable for all cameras, and some cameras can't see the real situation on their flat panels. Seeing these pairs of cameras will give you a good idea. 3, look at various functions: mechanical cameras are easier to do, first look at whether the metering is accurate, and constantly change the aperture and speed corresponding values in the light and dark. If it is convenient, find a camera or exposure meter to compare whether it is accurate. Next, check the self-timer, depth of field button and multiple exposure function. 4, look at the shutter: the first method is to listen, the second method is to look. To say "listen" is to open each shutter once to see if the time is accurate; "Look" means opening the back cover to see if the opening time is consistent with the speed dial setting. In addition, while watching, we should constantly adjust the aperture of the lens to see if the lens aperture lever is linked during exposure. Finally, connect the flash and conduct the flash test. See if it flashes synchronously. What we see here is whether to start or not. As for whether it is synchronized, it can only be shown in the real shot. The detection of electronic camera is very difficult, so you need to have very professional knowledge or be familiar with this camera, otherwise the dazzling functional experts can't see it clearly. Therefore, before buying, you must thoroughly understand and accurately understand the relevant information. Otherwise, it is easy to be "misled". Many people say that second-hand goods are not good. If they are good, who will sell them? You can't be wrong, but we need to realize that many reasons for eliminating second-hand cameras are not necessarily because the cameras are broken and outdated. Many professional photographers or photographers not only have a special liking for photography, but also have great curiosity about photographic equipment. They will buy new cameras with new functions and high performance as soon as possible. Many people will consider selling their old cameras when they have new ones.