Basic knowledge of photographic equipment that you must know.

Basic knowledge of photographic equipment that you must know.

Introduction: Many photographers have been playing photography for some time, but they are stumped by some basic common questions. This is the embodiment that the basic skills are not solid. Let's follow me to find out!

Basic knowledge of common photography and equipment 1 What's the small dial next to the viewfinder for?

A:? The small dial next to the viewfinder is used to adjust the diopter of the viewfinder, which is equivalent to the viewfinder glasses, so that photographers with vision problems such as myopia, hyperopia and presbyopia can also use the viewfinder normally. On some cameras, the dial may be hidden by the viewfinder protector (the protector installed on the viewfinder eyepiece). If you can't find the dial, you can try to remove the viewfinder guard. The dial can be adjusted negatively for myopia and positively for hyperopia. Observe and adjust the viewfinder until the objects in the viewfinder are most clearly displayed.

2 What is the function of the "Preview of Depth of Field" button?

A: The picture you see in the optical viewfinder when shooting is the picture with the lens aperture fully open. Therefore, if the preview picture in the viewfinder is compared with the actual shot when the aperture is contracted, the background blur and so on will be different. To confirm the depth of field in the viewfinder, you can press the Depth of Field Preview button while looking at the viewfinder. If the photographer narrows the aperture at this time, the picture in the viewfinder will be darkened, but the blur and focus range of the current aperture can be previewed.

Do I need to turn off the power of the camera when changing the lens?

A: It is common sense to turn off the camera power when changing lenses. Generally, when a digital SLR camera is turned on, the camera and lens are connected (communication state). Moreover, the power switch also has a reset function, which can not only check the state of the lens and the memory card, but also initialize the anti-shake compensation function.

Of course, even if the lens is turned on and removed, the camera will check the state of the lens bayonet, and generally there will be no problems. However, if the camera system is confused due to misoperation, some valuable shooting opportunities may be missed. Therefore, if you have spare time, you should follow the correct "operating rules" to prevent some accidents. In addition, like replacing the lens, it is best to replace the memory card when it is turned off. We still need to be careful to prevent accidents and data loss.

4 What is the "raw" format? Can it be clearer than JPEG photos?

A:? The "RAW" format can store the data shot by a digital SLR camera without image processing. This is equivalent to the fact that the film in the film camera is only taken and not developed. By the way, RAW means "raw" and "raw"

RAW format data is different from JPEG data. RAW is a special image format for digital cameras, and the models of various manufacturers are incompatible with each other. So be sure to use the camera's own software or professional image processing software to develop. Although RAW processing is a troublesome process, RAW data completely retains rich image information recorded by photosensitive elements, which can be used to process pictures in a wider range in the later stage. However, compared with JPEG, the file is much larger. The original processed data can be saved as JPEG or TIFF files, printed or edited.

Can I get the correct exposure with histogram?

A:? Histogram graphically shows the exposure (brightness distribution) of an image from bright to dark, which can be used as a basis for photographers to judge the brightness of photos when shooting. However, the brightness of photos varies greatly with different subjects. It is impossible to say which state is the most correct and which exposure is the most appropriate.

For example, if the histogram has a smooth mountain pattern from the central part to the left and right ends, it is generally considered that the photo is rich in gray. However, according to the subject's situation and the photographer's intention, sometimes it may be better to darken the photo. Histogram only provides a reference for whether exposure compensation is needed when shooting, and can't judge whether exposure is appropriate according to shooting intention.

6 Why are the four corners of the photo darkened? How can we avoid this situation?

A:? One of the reasons for the darkening of the four corners of the photo is the "insufficient peripheral light" of the lens. The lens is composed of several concave-convex mirrors, so sometimes the central part of the picture is very bright and the periphery is very dark, which is the most common phenomenon in zoom lenses.

Another reason for the darkening of the corners is the filter and hood. For example, if several filters are installed or the hood is not properly installed, and the lens and hood are not well engaged, the picture will be "missing". This phenomenon often occurs in lenses with a focal length between the wide-angle end and the standard, so you must pay attention when installing filters and hoods.

How can I take a good picture with a blurred background?

A:? There are several ways to blur the background, the simplest of which is to open the aperture of the lens to the maximum when shooting. The function of the aperture is to adjust the luminous flux of the lens. The smaller the aperture, the larger the focus range, and the less likely it is to blur. On the other hand, when the aperture is fully opened (the f value is the smallest), the focus range is the smallest, and it is easy to blur the background.

In addition, the longer the focal length of the lens, the easier it is to blur the background. Wide-angle lens is not easy to blur the background. In addition, the degree of background blur is also related to the distance between the subject and the camera. The closer the subject is to the camera, the farther the subject is from the background, and the easier it is to blur. When taking pictures, these methods can be combined to improve the blur effect.

If the color of the photo is unnatural, how should I adjust it?

A:? If you think the tone of the photo is wrong, try to change the setting of white balance. White balance is a function that can faithfully reproduce the color of the subject in any light condition. If set to "Auto", the camera will automatically adjust the color tone according to the environment, but the result may not be as expected. For example, when the yellow light emitted by a light bulb or other indoor lighting overlaps with the natural light from the window, its light is a mixture of many colors. In this case, "automatic white balance" is difficult to judge.

White balance has many settings such as "sunny", "cloudy", "incandescent" and "fluorescent". When the setting of white balance is consistent with the light source environment in the scene, the white object is white, so that the color of the object can be faithfully reproduced. In addition, if you try to set the white balance to be inconsistent with the actual environment, sometimes surprising results may appear. Moreover, the camera also has the function of fine-tuning the white balance, and the photographer can confirm and adjust the tone he wants through the LCD screen on the back of the camera.

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