Photometric skills of SLR camera

For some SLR enthusiasts who enter the door, how to use spot metering when taking pictures with a camera? The following is the spot metering technique of SLR camera I brought to you, hoping to help you.

Spot metering mode of SLR camera 1 Matrix measurement (evaluation measurement and subsection measurement)

When shooting, the camera divides the image into several areas for photometry, and then calculates the most appropriate average exposure required for the whole picture to ensure accurate exposure. Matrix photometry (or separated photometry) divides the viewing screen into several photometry areas, and after each area is independently photometered, an integral exposure value is calculated by integral integral weighting.

Multi-zone evaluation photometry is the most advanced intelligent photometry method at present, and it is a kind of judgment that simulates the uniform or uneven illumination that the human brain often encounters when shooting. Even people who are not familiar with photometry can generally get films with more accurate exposure in this way. This mode is more suitable for photos of big scenes, such as scenery and group photos. The effect is best when shooting scenes with relatively positive light sources and uniform illumination. At present, it has become the most commonly used metering method for many photographers and photographers.

Photographs suitable for large scenes, such as landscapes and group photos, have become the most commonly used metering methods for many photographers and photographers.

2. Center key average metering (center average metering)

Average the photometry of the whole image, but focus slightly on the central object. The center focus average metering mode is a very reliable metering mode, which is suitable for almost all subjects. To sum up, it is necessary to choose the center average metering system to shoot the content that needs to show the main body and take into account the overall exposure.

For example, Nikon's camera uses the central key to average metering, and the metering in the central part of Nikon's camera accounts for 75% of the total metering ratio (this ratio varies from brand to brand), and the metering data in other non-central parts gradually extend to the edge, accounting for 25%. In most shooting situations, central focus metering is a very practical and widely used metering mode, but it is not applicable if the subject you need to shoot is not in the center of the picture or under backlight conditions.

Central focus photometry is a traditional photometry method. Most camera metering algorithms pay attention to about 2/3 of the center of the picture, and consider the periphery. For photographers who are used to using central focus metering, it is easier to control the effect by using this metering method than by using multi-zone evaluation metering method.

3. Central part measurement (or partial measurement)

Central part measurement and central average measurement are two different measurement methods. The center average photometry is mainly based on the central area, supplemented by other areas, while the central part photometry only measures one area in the center of the picture, and the photometric range is about 3%- 13%. The central part metering mode is suitable for some scenes with complex light, and more accurate exposure is needed at this time. Using the central part to measure light, you can get photos with accurate exposure of the object. The central part photometry can be applied to some special harsh shooting environments, which can further ensure that the camera processor can calculate the exposure required for the main object part in the center of the picture. This mode is most suitable for scenes such as stage, performance and backlight, but due to the rise of split metering (matrix metering) mode, this mode is becoming less and less common in cameras.

Suitable for shooting purposes: accurate metering is needed under certain conditions, and this mode is most suitable for scenes such as stage, performance and backlight where the metering range is larger than spot metering.

Fixed point photometry

In this mode, when metering and shooting, the metering system only measures 3% of the area within the framing range, completely ignoring the exposure requirements of other surrounding backgrounds. If the contrast between the subject and the background is relatively large, you can consider spot metering, such as backlight shooting:

This is a fairly accurate photometric method, but it is not so easy for beginners to master. How to distinguish a metering point has become a skill to be learned. The photos taken by the wrong metering point are either overexposed or underexposed, resulting in serious exposure errors. Because of the skill of spot metering, it can also be used in macro shooting of digital cameras, which can make macro exposure more accurate. Therefore, people who like macro photography must study this metering method hard, and initially choose the middle small area in the picture as the metering reference point. Spot metering is also a good weapon in portrait shooting, which can accurately expose parts of people (such as faces and even eyes).

Using skills of SLR camera 1 spot metering. When shooting people, choose to get them out of the state of carrying light sources as much as possible.

This lighting has the following advantages:

1, because the subject is carrying the light source, his eyes and expression can be relaxed freely (the subject can't open his glasses when facing the light source, his facial expression is tight, squinting, etc.). )

2. If we shoot a girl with backlight, we can also shoot specific effects in this way, such as blonde hair and bright eyes. It is important to note that the exposure should be determined according to the face when using spot metering. At this time, the exposure is determined according to the illumination of the face, so the background and the hair of the character will be overexposed, and this overexposure is the reason for blond hair.

Strictly speaking, spot metering is suitable for any scene, such as stage photography, sports photography and scenery films (the spot metering of these scenes should be selected according to the subject). The purpose is that as long as the equipment in your hand is ready, there is no need to burn the equipment.

Second, correct exposure

1. Select spot metering mode.

On most cameras, there is a metering mode selector, which is usually located at the top of the fuselage. You can select the metering mode by pressing the button or rotating the dial, and the symbol of metering is a point.

2. How to use it

Assume that the photometric point is the central focus. Aim the focus at the subject, press the shutter half to focus, and then press the shutter fully to finish shooting. If the metering point is not in the middle tone, exposure compensation should be applied appropriately.

3. The subject is not in the center of the picture

When the subject is not in the center of the picture, measure the light according to the above method. After the focus is displayed, press the automatic exposure lock button (AE-L) to lock the exposure setting, and then change the composition to complete shooting.

Shoot the scenery, master the coverage area of spot metering, and measure the light accurately.

The area covered by the metering point is very small, so the metering result is very accurate, so that you can accurately expose a specific location. However, there will still be problems. The metering system of the camera will expose the area where the metering point is located according to the intermediate tone, so if the actual area is dark and the metering system still determines it as the intermediate tone, the subject will be too bright or even overexposed. On the contrary, if the actual area where the metering point is located is very bright, the shooting result using spot metering will be underexposed. Therefore, it is necessary to make corresponding adjustments according to the actual situation and apply exposure compensation appropriately.

Personal feeling is that the metering method depends on the specific environment and the theme to be expressed. In the case of large light ratio contrast, spot metering is more accurate, which can ensure the accurate metering of the required theme part. When shooting the western Sichuan Plateau, it is often necessary to show the rich details of the sky and clouds, and spot metering is often used to point out the clouds in the middle of the sky.

In terms of metering mode, your camera offers a variety of options. Including centralized key measurement, average measurement, partial measurement, multi-zone measurement and point measurement. Spot metering mode allows you to accurately and independently measure the light in a small local area on the selected subject according to the scene environment. In the case of uneven light (the brightness difference between the background and the protagonist is great), spot metering has great advantages. In the case of white gauze, sea water and beach, spot metering mode can be used to measure only the subject.

Shooting experience: To be honest, apart from shooting this group of beach brides, I will choose spot metering according to the scene, and I usually don't pay much attention to that metering method and don't need exposure lock. Because I first learned the film machine, I am used to judging parameters. Now it is more convenient to use numbers, and we can control the exposure very accurately. The day when this group of films was filmed happened to be cloudy. Occasionally, it is also beautiful to shoot some small backlights in dew point sunlight, and the overall exposure is reduced. It is not easy to achieve the ideal effect when measuring light. Although my films are rarely used in the later stage, this group of original films is a little gray. It is good to adjust the picture a little later, and the color levels and curves are bright.

People who have seen the spot metering technology of SLR cameras also see:

1. explanation of manual shooting skills of SLR

2. Detailed explanation of full manual mode of SLR camera

3. Nikon d7000 usage skills: portrait photography metering skills.

4. Photography light skills

5. Several shooting techniques of SLR.

6. Nikon 100 photography skills and tricks