Looking inside from the outside of the SLR lens, I found 4 small black dots, what are they? What to

You remove the lens and look at the lens and the CCD, if you can still see through the lens, it is in the lens, if you can't see it, then you see if the CCD is clean.

Basically, if it's dust on the outside of the lens, you use a blow ball and a special cleaning cloth to clean it, remember to wipe it in a circular direction when wiping, if it's the inside of the lens, don't get it, take it to the camera equipment store and let them remove it for you.

If it is a black spot on the CCD or CMOS, please blow it off with a blow ball, if it can't be blown off, see if your machine has its own image sensor cleaning function, if there is one, let it clean automatically, if not, then take it to the camera equipment store and let them clean it for you.

In terms of imaging, you can shoot on red, yellow, blue, and white four single-color papers, remember to fill the whole sheet with color**, and then use the computer to see if there will be an impact on the imaging, generally speaking, small dust will not affect the imaging, unless it is shot in strong light, the dust will have a certain scattering effect, it will have an impact.

Hope it helps.

Not dust in the lens, but dust in the viewfinder. No impact on image quality. This dust cannot be cleared. Unless disassembled. Personally, I don't think it's necessary.

I also think it's in the viewfinder. Can be ignored.

If it doesn't affect the imaging, then it's fine, it shouldn't be dust in the lens.

First, the cause of the failure:

1. SLR. There are small black dots in the viewfinder and photos are also in the same place, which should be a problem with the lens, and it is recommended to check it again with a different lens.

2. If there is no black spot in the viewfinder and there is a black spot in the photo, then there should be dust or dead pixels on the image sensor.

Cleaning or repairs are required.

2. Solution:

1. If you find black spots through the viewfinder, the easiest thing is to see if the front end of the lens is stuck to dust and other dirt, and if so, gently wipe it off with lens polish.

2. If the lens is clean, unscrew the lens down to see if there is any dirt on the lens that is connected to the body, and if so, wipe it off with lens polish.

3. If these two places are clean, just look at the body behind the unscrewing lens, you will see a very bright white lens obliquely, see if there is any dirt on this lens, if there is, gently wipe it off with an air blow or a wiping cloth according to the situation.

4. If these places are very clean, don't install the lens after removing it, gently dial up the reflector inside the fuselage, you can see that there is a rectangular sensor inside, look at the light to see if there is any dirt on the sensor, if there is a cotton swab or a soft brush to gently wipe it off.

5. Clean the back screen of the viewfinder, that is, the part where the eyes stick to it, which is easy to get dirty, you can first remove the leather pad of the viewfinder and wipe the lens with lens polish.

6. Turn the camera to the B bulb, then press the shutter and don't let go, the shutter will keep open to reveal the image sensor, see if there is any dust on it, if there is one, blow it lightly with an air blower, and do not release the shutter during the whole process.

There are three possibilities for the viewfinder and the photo to have black dots (dead pixels), and the reason for the question should be the first

1. There are small black dots in the SLR viewfinder The photos are also in the same place, which should be a problem with the lens, and it is recommended to change the lens and check again.

2. If there is a photo in the viewfinder, then it is a problem with the viewfinder, which will not affect the imaging and may affect the mood;

3. If there is no black spot in the viewfinder and there is a black spot in the photo, then it should be a problem with the image sensor, which is the most serious.

There are small black dots in the viewfinder that are gray on the focus screen, and there are small black dots in the photo that the sensor is gray, and the lens is gray will not appear in the viewfinder and photos.

If there are dirty spots in the same position as the optical viewfinder and **, then there is dirt on the lens.

If it's live view, it's dirty on the CMOS.

Basically, it can be determined that there is ash on the CMOS.

First of all, look at whether there is dust on the Uwei lens, you can take it off and wipe it, and then doubt whether there is dust on the secondary reflective lens, and you can see the reflective lens inside the fuselage by removing the lens.

In the end, I went to doubt and wipe the lens.

If you see a black dot from the inside of the optical viewfinder, there are three possibilities: the dust version inside the viewfinder, the dust on the reflector, and the dust inside the lens;

If you see dust from the screen viewfinder: there are two possibilities: the screen is dirty, and there is dust on the sensor;

If you see dust on the **, there are two possibilities: dust inside the lens and dust on the sensor.

If it is the dust seen on the electronic screen, and it is determined that the position of the ** dust is the same as that of the photo, it is a grain of dust, this dust must be on the sensor, remove the lens, and clean it with an air blower. If you can't figure it out yourself, you can find a camera repairer to deal with it, it's a simple little problem.

The focus is on the sensor, because if it's dust on the lens, the image is almost imperceptible

That's right. First, see if the spot is outside the lens, and if so, wipe it with lens paper. If not, take it to the maintenance department and clean it up.

The preliminary judgment is caused by lens pollution, if you see it, but you don't shoot it, it is a stain on the reflector or pentaprism, if you can't observe the stain, and you shoot it, it is on the image sensor, above.

315 party**. It's a problem at the time of production, you can shoot the 601D model, after-sales Nikon, you are really lonely. It's been a long time. Customer service is available. I do not exchange Nikon for the company.

This kind of problem is very common, and sometimes they don't admit that it is their problem when looking for after-sales service! It's the clutter inside the lens, it's the camera problem,