How can it be fast. Learn focal length and distance setting in photography. Thank you

Starting from aperture, shutter, focal length, and sensitivity, and then learning to stabilize the camera, these are the basic skills, and then there is composition, you can practice composition with anything, rangefinder, SLR, card player, and even mobile phone, four fingers.

I first read books on equipment and photography of various subjects, and then I read books on composition. Now you look at the books published by the New York School of Photography, less of those SLR camera crash books, Bibles and the like, misleading people's children, and look at books outside of operation, such as photography ideas.

Look at some photography, paintings, and increase your appreciation.

Don't use automatic gear when taking pictures, it's fun to do it manually, don't blame the camera if you don't take a good picture, think about what you did wrong, what aspects need to be improved, listen to more advice on photography thoughts, talk more about technology and ideas, and think more about what happened before pressing the shutter; Rely less on post-production, talk less about cameras, and buy and sell cameras.

Practice is the most important thing, I summarize the steps myself, and each of the following steps is practiced before practicing the next step.

Step 1: Take a photo with all the scenery clear**.

Step 2: Take a photo with clear and other blurry subjects**.

Step 3: Shoot with a high-speed shutter.

Step 4: Shoot at a low shutter speed.

Step 5: Photograph objects moving at low speeds.

Step 6: Photograph objects moving at high speed.

Step 7: Shoot at night.

Step 8: Shoot low-key**.

Step 9: Shoot high-profile**.

Step 10: Follow the shooting.

Step 11: Pose for a photo, with natural light.

Step 12: Pose for a photo and light yourself.

Step 13: Capture and show the big scene.

Step 14: Capture and express the character's expression.

Step 15: Find a way to shoot yourself into ** without the camera appearing in **.

Step 16: Create your own innovation.

Before the fifteenth step, the use of flashing lights is prohibited.

In fact, more shooting and more practice is the best way. This is something that has no standard answer per se.

Some of them are for your composition services, and you can find some information about composition.

The other one is to look at other people's works. The more you watch, the more you think, the more you think about it. In the end, these things are all about the picture you want to achieve.

This needs to be practiced, buy a camera and debug.

I have already studied this physics when I was in middle and high school, so it is recommended to review it. A lit candle ......bConvex lens ......c Imaging screen. ab = object distance also = subject distance. bc = image distance is also called focal length.

Find a master to take it, practice a lot, there are no shortcuts.

Convex lens to determine focal length:

1. Take out the convex lens to be measured, facing the sunlight, and then put a piece of paper on the other side of it, move it back and forth, and observe the change of the light spot (bright spot). Adjust the position of the convex lens to make the spot smallest and brightest.

2. Use a scale to measure the distance from the spot to the center of the convex lens and record it.

3. Repeat the above experiment 2 times to find the average value of the distance measured 3 times, that is, the focal length of this convex lens.

Concave lens determines focal length:

1. Place the concave lens facing the sun, and the white paper is parallel to the concave lens;

2. Use a scale to measure the diameter of the bright ring on the white paper as d;

3. Measure the distance from the white paper to the concave lens as L;

4. Measure the diameter of the concave lens as d.

5. Calculation by formula: f=dl (d-d) The optical system with a short focal length has a better ability to concentrate light than the optical system with a long focal length. In simple terms, focal length is the distance between the focal point and the center point of the mask.

In the camera, the focal length f and image distance < 2f to image.

Many friends may not know what the actual situation is, I also checked some information content on the Internet, so I will share it with you below to familiarize yourself with the actual situation of how to adjust the focal length.

Whether it is a full-frame camera or an asp-frame camera, although there are significant differences in the scope of the whole process of photography, the focal length adjustment method is also one of the key components in photography, and its adjustment keys can be used to adjust the concentration and dispersion of light.

Focal length characteristics: In the whole process of taking pictures with the camera, as long as the camera lens of the focus type is involved, it will involve the focal length problem, which is substantially different from the fixed focus, the fixed focus does not need to adjust the focal length, only the light source problem and its depth of field effect problem can be noted. Adjust the focal length, which is commonly used in zoom lenses.

How do you adjust the focal length when using a zoom lens?

According to the zoom lens used by the customer, the focal length difference is different, and the things that must be paid special attention to in the whole process of focal length adjustment are also essentially different, such as the focusing surveillance camera used by the customer is 70 200 kinds of large zoom camera lenses, in the whole process of focusing adjustment, according to the overall goal of shooting, the focus points that need to be paid attention to are obviously different, such as the image of the tourist attractions taken must be key to highlight the key reference, must be the depth of field effect, At this time, the whole process of focal length adjustment needs to take the overall goal of the theme style as the core, when the picture quality is adjusted, the bright red focus point shining through the window should be focused on the overall goal, and the focus will be adjusted slowly, the market prospect will be substantiated, and the background will be blurred.

How to adjust the focal length, will unreasonable adjustment of the focal length harm photography?

If the focus of the landscape is to highlight the panorama, the focal length needs to be longer, so that when the landscape is displayed, the real appearance of the photographed landscape can be clearly presented. In addition, the focal length is also closely related to the texture of the landscape photographed, and the depth of field effect and blurring are all related to the change of focal length.

How to adjust the focal length, will unreasonable adjustment of the focal length harm photography?

In the focal length adjustment, the focal length, the focal length and the distance between the photographed person, the balance point should be found in the middle of the three, generally in the focal length adjustment, increasing the focal length and pulling distance can have the actual effect of blurring, on the contrary, the depth of field effect will be smaller.

How to adjust the focal length, will unreasonable adjustment of the focal length harm photography?

There are some customers who use SLR cameras to choose automatic photography function, the focal length is fully automatic adjustment, do not need the photographer to adjust the focal length, take pictures clearly, but lack of cultural and artistic sense, such as manual adjustment of the focal length, such as the occurrence of problems, the focal length adjustment is unreasonable, it will cause the photo taken to be blurry.

Adjustments can be made with buttons. It has a very good effect, it will affect the effect of photography, it will affect the saturation of photography, it will affect the brightness of the photo, and it will affect the shadow of the photo.

If you focus, the main thing is that you zoom in on the camera and aim it at the one you're shooting. The figure is then shifted to his focus.

When shooting, be sure to adjust the focus according to the distance. Focal length has a great impact on the photographic effect, and being able to choose a suitable focal length can make the best effect better, and the angle and clarity of the shot are also very good.

You can rotate the camera so you can adjust it. It will make the shooting effect better, and it will also make the people in ** see it better.

Adjust the camera's buttons to adjust the angle of shooting. It will affect the effect of taking pictures, affect the color, and affect the clarity of the image.

1.Focal length is an optical term that refers to the distance from the center of a lens to the focal point. A photographic lens is made up of a lens and therefore also has a focal length, which is the distance from the principal point of the optical back of the lens to the focal point.

Focal length is a basic and one of the most important indicators of a lens. We often use focal length to describe or name a lens, such as 50mm lens, 35mm lens, etc.

2.In photography, the essence of focal length is to determine the angle of view of the lens, that is, how much of an image can be captured. The angle of view is actually determined by two factors: the focal length of the lens and the size of the film or sensor, but it is customary to use the most common 35mm camera as the benchmark.

The image above is a diagram of focal length vs. angle of view (35mm). As you can see from the figure, the 15mm lens has a 180-degree angle of view, which means that you can shoot images within 180 degrees in front of the lens. The angle of view of the 50mm lens is 46 degrees, which is basically close to the viewing angle of the human eye, so the image captured by the 50mm lens is closest to what the human eye sees, so it is also called a standard lens.

Again, the correspondence in this graph is based on a 35mm camera. If you use a different format camera, the correspondence will also change. Traditionally, we use the focal length multiplier to convert the actual focal length to the equivalent 35mm focal length.

3.Traditionally, we use a 35mm camera as a benchmark and divide lenses into categories according to focal length. The three most basic categories are wide-angle, standard, and telephoto. On this basis, it can also be subdivided into fisheye, ultra-wide-angle, medium telephoto, ultra-telephoto, etc.

Specifically, 35mm or less is called a wide-angle lens, 80mm or more is a telephoto lens, and the middle part is called a standard lens. Since different focal lengths have their own unique imaging characteristics, this classification helps you choose a lens.

4.Depending on the angle of view, the image captured by different focal length lenses will also be different. A standard lens is closest to the human eye's point of view, and the resulting image is closer to the actual scene we see.

As a result, the standard lens is suitable for almost all subjects, such as special news or documentary. But it is also because it is very close to what people see, and it has become more difficult to shoot something different.

The wide-angle lens has a larger angle of view, so the picture will show a larger range of scenes than the human eye can see, which is generally more suitable for shooting large scenes such as landscapes. In addition, because the wide-angle lens has a strong sense of spatial perspective, it can make ** more visually impactful, so it is popular with documentary photographers.

A telephoto lens is actually a telescope, and the scene captured is smaller than the range that the human eye can see, and it is conducive to achieving a shallow depth of field effect, so it is very suitable for shooting with a clear subject**, especially for portrait photography or wildlife photography.

Controls the size of the image. In the case of the same object distance, the longer the focal length of the lens, the larger the image, and vice versa.

Simply understood as the angle of view of shooting, the shorter the focal length, the wider the angle of view of shooting. The longer the focal length, the narrower the angle of view.

Focal length, also known as focal length, is a measure of the concentration or divergence of light in an optical system, and refers to the distance from the center of the lens to the focal point where the light is concentrated. It is also the distance from the optical center of the lens to the imaging plane such as the tintle or CCD or CMOS in a camera. Optical systems with short focal lengths have a better ability to concentrate light than those with long focal lengths.

The lens of a camera is a set of lenses, and when the light parallel to the main optical axis passes through the lens, the light converges to a point, which is called the focal point, and the distance from the focal point to the center of the lens (i.e., the center of light) is called the focal length. Lenses with a fixed focal length, i.e., prime lenses; A lens whose focal length can be adjusted is a zoom lens. (When a beam of light parallel to the principal axis of the convex lens passes through the convex lens, the other side of the convex lens will be converging into a point by the convex lens, which is called the focal point, and the distance from the focal point to the optical center of the convex lens is called the focal length of the convex lens.)

A convex lens has a focal point on each side. ）

The lens of the camera we use is equivalent to a convex lens, and the film (or the image sensor of the digital camera) is located near the focal point of the convex lens, or in other words, the distance between the film and the center of the convex lens is about equal to the focal length of the convex lens.

Changing the focal length is not only a change in image distance, but also a perspective effect, such as using a telephoto to shoot a person's face at a distance** and a wide-angle shot of a person's face at a close distance**, you can achieve the same frame but the perspective effect is completely different.

The focal length of the lens will not change, but due to the size of the sensor, in order to get the same frame, the focal length is changed to the focal length when it is 35mm film, that is, the relative focal length!