What should I pay attention to when selling second-hand SLR? Does the number of blinds matter?

Shutter is very important, but before that, the most important thing is to know how long it has been used. If it takes a long time and there are really few shutters, then the machine may not be good because the parts are beginning to age. On the contrary, the time is short, but there are many shutters. Maybe a new shutter will be just like a new one.

So the key is to look at the color and know the frequency used by others. Of course, it is used less and maintained well. As for the shutter, it is only a parameter, which is of course important, but don't just look at this, this number can be faked.

Need to pay attention to the following points:

1, study before buying.

First of all, when you buy a camera, you will definitely study the parameters of the camera you need and the common problems of various cameras, and then determine the style you want to buy. Don't forget to take the second-hand price into account when studying various parameters, so as to buy a second-hand camera with higher cost performance.

2. Pre-purchase testing

After research, you will know the common problems of the camera you want to buy, and you can test the common problems of this camera before buying. Sometimes, after a short test cycle, we may still miss some existing problems, so we can negotiate a longer test cycle with the seller, such as one or two days.

3, do a comprehensive visual inspection.

When we get a second-hand camera, the first thing to do is to give him a comprehensive visual inspection. See clearly everything you can see, especially some places that are easy to ignore. Small scratches on the surface are often the best way for us to reduce the price. After reading it, you should also pick up the camera and shake it to see if there are any fragments in it. If yes, change it.

Step 4 shoot with your own lens

Next, put on your own lens to shoot. Sometimes the interface surface between the fuselage and the lens looks good, but if the lens is connected, there will be blurred images and light leakage. Then, you can watch another one. If the interface is normal, then check whether the sharpness and focus of the photo are normal.

Try changing the aperture, shutter speed, etc. See if there are any problems; Shoot with a long exposure time to see how noisy the camera is; Take a photo with a white background and a new photo to see if the sensor is bad.

5. Check the number of shutters

It is also important to check the shutter number of the camera. As sellers, they will try to understate the number of shutters. When checking the shutter number of the camera, we don't just look at the file name on the camera, because the file name can be reset to zero manually, but we use special software to check it. The shutter of a general camera is100000-150000.

6. Check all buttons and controls.

The next step is to check all the buttons and controls. If some buttons are harder to press than usual, then this button may be dirty and there is some rubbish in the gap around the button. This needs cleaning.

Another possibility is that it was damaged and the seller did not replace it. If there is something wrong with the buttons or other space, either find another camera or cut the price sharply! Repairing a button is not cheap.

7, check whether there is a software error.

There are errors in software, mainly caused by hardware failure. When you study the camera before buying it, you will know which mode the camera is most prone to software errors. You can try to do this without damaging the camera. If the camera is still fine after trying, you can check other problems.

8. Don't forget to check the viewfinder.

The last thing you should do is to check the viewfinder to make sure everything on the display is normal. The display screen is a very fragile place. Many times, due to improper cleaning, the display screen cannot be displayed locally.

Extended data:

SLR cameras (SLR cameras) are also called SLR cameras. Refers to a camera that uses a single lens, through which light shines on the reflector and takes a view through reflection.

The so-called "single lens" means that the photographic exposure light path and the framing light path * * * use one lens, unlike the paraxial camera or the double-reflex camera, the framing light path has an independent lens. "Reflection" means that a plane mirror in a camera separates two light paths:

When watching, the reflector falls, reflecting the light of the lens to the pentaprism and then to the viewing window; When shooting, lift the reflector quickly, and the light can shine on the film or photosensitive element CMOS or CCD.

First, how to check the shutter times:

1, Baidu search "exif information viewer", and then click enter.

2. At this time, we will see the alpha version of EXIF browser, click and select the file directly on the web page, and there is no need to install software.

3. Select the last photo taken in the camera and upload it. At this time, you can see the shutter times in the EXIF information summary of the photo.

Second, the maintenance of SLR cameras:

1, lens maintenance and cleaning

The lens is the most critical and fragile part of the camera, so when using the camera at ordinary times, we should pay great attention to the protection of the camera lens, and don't get contaminated with dust easily, and don't let the lens be "dirty" by dirty hands. Only when it is absolutely necessary should we clean the lens.

When cleaning, it is best to blow off the dust with a balloon or gently brush it off with a soft brush. If you encounter stubborn dust, you must gently wipe it with special lens cloth or lens paper. Remember not to use soft-looking paper such as paper towels to clean the lens, because these papers contain wood pulp that is easy to scratch the coating, which will seriously damage the key coating on the camera lens.

2. Protection of LCD screen

Color LCD screen is easily scratched by hard objects, especially the color LCD screen without protective film is more fragile. Any scratch will leave a permanent mark. So when using it, you can consider sticking a protective film on your PDA or mobile phone, which has a very good effect on protecting the color LCD screen.

In addition to preventing scratches, special attention should be paid to avoid the damage of high temperature to color LCD screen. As the temperature rises, the color LCD screen will turn black. After reaching a certain temperature, even if the temperature drops to a normal state, the color LCD screen cannot be restored, causing irreparable losses.

3. Use and maintenance of batteries

Digital cameras are different from traditional cameras. Digital cameras have a great demand for electricity, so SLR cameras generally use nickel-hydrogen batteries or lithium batteries as power sources.

Ni-MH battery will produce memory effect, reducing the total capacity and service life of the battery. As time goes on, the stored charge will be less and less. Therefore, try to use up the power before charging. The memory effect of special lithium battery is almost negligible, so special attention is not needed.

In addition, attention should be paid to maintaining the integrity of the battery insulation. Once the damage is found, stick it with transparent tape. Always check whether the electrode of the battery is oxidized, and wipe it clean if it is slightly oxidized. When serious oxidation or falling off is found, the battery should be replaced immediately to avoid damage to the single-lens reflex camera caused by battery leakage and other faults.

In addition, when the digital camera is not used for a long time, the battery must be removed from the digital camera or charger, completely discharged, and then stored in a dry and cool environment.

4. Travel guarantee

Protect the lens with the lens cover, put small equipment and accessories in the bag and hand, and separate them with certain soft objects to ensure that they will not collide with each other. Especially those easily damaged equipment, should be wrapped in a soft layer.

When flying, the damage degree of metal detector is slightly less than that of baggage detector. If necessary, manual inspection can be required to minimize X-ray damage.

5. Long-term preservation of digital cameras

When the digital camera is not used for a long time, we should pay attention to the maintenance of other parts and accessories besides the important parts such as the body and lens. The camera and holster should be placed separately to prevent the moldy holster from affecting the camera. Parts such as shutter and self-timer that have been tightened in the camera should be loosened to avoid damage caused by fatigue of these parts for a long time.

The lens aperture should be set at the maximum gear and the focusing distance should be set at infinity. If it is a camera with a dual focal length lens or a zoom lens, the extended lens should be retracted to its original position and then put into a storage container that can be kept dry.

Baidu Encyclopedia: SLR Camera