How are there many exposures in photography, and how are the two exposures said in photography done?

At present, the multi-exposure function is only available on the Nikond 200 300 on the DSLR.

First of all, your camera should have a multi-function function. In the past, non-DSLRs were generally available, but now in the digital age, it is necessary to see if the machine has such a function.

If it is a previous SLR, use a tripod to support, press the multi-** button, and then press ** number of times to set the **amount** each time (for example, if you ** three times, each time** about one in three, of course, it is not excluded that there are special requirements).This allows for multi-**.

If it's digital, adjust the setting of multiple **, support it with a tripod, and it seems to automatically help you adjust the ** amount.

In addition, you can use the layers in Photoshop, and you can think about it as many times as you want.

Look at the camera If the camera has this function, it can be done while shooting.

Without this feature, just shoot twice and compose it in post-production with Photoshop.

Shooting parameters: Camera: D3 ISO: 250 Aperture: Shutter: 4850 sec.

Shooting conditions: aSturdy tripod with shutter release cable;

b.If you shoot north with the North Star as the center in a cloudy environment without light pollution, it will turn into a circle of star tracks, otherwise you can only shoot a series of tracks instead of a circle;

The moon is exposed to the parameter ISO 200 for about 90 minutes, the 1 2 moon is exposed to the parameter ISO 200 for about 60 minutes, and the 2 3 moon is exposed to the parameter ISO 200 for about 40 minutes

Shooting skills: Mode B shutter manual focus shooting;

b.The humidity on the mountain is heavy, so pay attention to whether the lens is foggy so as not to be busy in vain;

c.If there are vehicles passing by at the filming location, you should pay attention to whether the vehicle lights will affect the shooting, and use a black card to cover the lens to avoid the impact of the lights if necessary;

d.The tripod you buy must be stable, and try to find trees or flowers that will not be shaken by the wind in the foreground.

Other: aAppropriate lighting (headlights or flashlights) is required;

b.It is usually very cold in the high mountains, so you need to take care to protect yourself from the cold;

c.The battery may shorten the working time due to cold weather, it is recommended to bring an extra battery for backup;

d.The city is not suitable for taking star trails (you can't see the stars even if you look up) because of the serious light pollution

e.If you turn on the body irritation function, it will waste a lot of time, so it is recommended to use post-production software to reduce irritability.

The shutter time can be controlled directly with the shutter priority (TV stop) and the manual speed (M stop).

In addition, with the B gear, you can control the shutter time at will (press the shutter to start**, release the shutter to end**).

There is a B door on the camera, and if you press and hold the shutter, it will always be open, in order not to shake, you also need a tripod and a shutter release cable, and there is a T store camera that presses the shutter to open, and then press the shutter to close, and the shutter release is omitted.

For long periods of time**, you need to use a tripod, keep it steady, then lower the sensitivity, slow down the shutter speed, and stop down the aperture.

You can test shoot a few shots first, adjusting the shutter speed and aperture to achieve the desired effect.

If you have questions, you can add them.

How long it takes depends on the light, if the light is strong, it will be overexposed for a long time.

A few ways: 1. Reduce the ISO to a minimum of 100

2. Small aperture.

3. Adjust the white balance.

4. This is the most invincible, manual**, you press the shutter to start**, you press the end again**, you can expose it all night, and use this to shoot the linear starry sky.

Double exposure, which refers to multiple attempts on the same negative, is a must-play technique for many people when it comes to the camera, and mysterious and unspeakable visuals often make people addicted. Today's mid-to-high-level automatic cameras have a multi-time function, and you can set multiple times by using the function settings.

We can import the captured ** into the computer, and then use image processing software to overlap **, you can achieve the effect of double**. And when overlapping, you can also enlarge or shrink the ** locally, and this digital "stacking bottom" method greatly increases the convenience of double **.

Second-time is a shooting technique based on chance.

It can be shot with a 135mm camera and is easy to master. Just shoot the whole roll of film without having to worry about remembering what was being shot. Then, rewind the film and shoot it again with that roll. Both black-and-white and color film can be used for shooting.

The only thing that should be noted is that the footage of the second shot must accurately coincide with the image taken the first.

Advantages of secondary **:

First of all, there is no limitation of space and time in the second operation in the later stage, as long as you think about it, you can do it. Some content that cannot be filmed together at the same time due to time or geographical restrictions can be realized in post-production, as long as the material can be found, such as people and landscapes, landscapes and flowers, flowers and sky, sky and animals, etc., can be reprocessed.

Secondly, you can control the clarity of the display of the two scenes, the size of the displayed area, and the local details displayed can be controlled by using the secondary ** in the later stage. Finally, in the later stage, the operation of the second ** is completely autonomous, not only can the second **, but also the third and fourth times can be completed.

In the days of film presses, secondary means being on the same film twice. Then in the era of digital machines, it should be interpreted as being in the same **serial number (the same **)**twice. 50D can't be done twice during shooting**, it can be composited in post.

Photography enthusiasts usually encounter various problems when taking photos, such as shooting for a long time. So what should you pay attention to? Let me share with you the specific methods and experiences.

Digital cameras. Beware of weather changes for night shoots and prepare a jacket and rain gear.

Some of the factors that influence photography**:

1. Some environmental factors: different seasons, shooting area, environment and brightness of the shooting background will affect the ** value.

2. After using the film with special sensitivity, the hand mega value is not corrected in time;

3. The reciprocal rate fails. Sometimes the illumination of the film emulsion is too large or too small, and the time is too long or too short, and the same amount of photographic effect does not produce the same photographic effect.

4. The scope of use of photographic equipment exceeds the limit.

5. The flash is used as the lighting source, and the ** value is not correctly calculated according to the index of the lamp.

6. When shooting, add colored filters to the lens, but do not increase the ** value accordingly, and the result will also cause insufficient ** consequences.

7. The roughness and smoothness of the surface texture of the subject, and the depth and shallowness of the color will affect the ability of the object to absorb and reflect light.