Letter photography

1. Depth of field: the distance range for clear imaging. Small depth of field, clear subject and blurred background. If there is a prospect, the foreground and background will be blurred and the subject will be clear. When the depth of field is large, the subject and background will be clearer, and the depth of field has a relative influence on the object distance and focal length.

2. Aperture: Control the amount of light entering the lens. The value after the letter f is the aperture value. The smaller the f value, the larger the aperture and the more light entering. The smaller the depth of field, the shallower the background, and the smaller the part of the subject that defines the focus position. The best aperture value is generally the maximum aperture value minus two steps. The brightness of a photo is related to exposure time and sensitivity.

3. Shutter speed: that is, the time from opening to closing of the shutter. The shutter is in seconds. A common shutter is 1/X seconds. The larger the x value, the faster the shutter speed. However, the shorter the exposure time, the darker the photo; Here, we need to know that a safe shutter is that the shutter speed must be less than the reciprocal of the focal length. For example, if you use a fixed-focus 100mm lens, then your shutter should be at least below1100s, so the probability of taking a clear photo will be higher. At the same time, it can play an anti-shake effect.

4.ISO sensitivity: The higher the ISO, the more light you can capture. At the same shutter speed, the aperture can be relatively reduced after increasing ISO. However, it should be noted that high sensitivity has a common problem, that is, the higher the ISO, the stronger the noise of the photo. This is why experienced photographers recommend shooting with low sensitivity parameters.

5. Focal length: a number on the lens, such as: 18-55 mm/F3.5-5.6, 18-55 mm refers to the focal length and F3.5-5.6 refers to the aperture value; Ordinary aperture has a constant aperture and a dynamic aperture, so the above parameters are that when the end is 18, the maximum aperture is F3.5, and when the focal length is 55mm, the maximum aperture is only F5.6.

6. Exposure: This parameter is very important and determines the brightness standard of your photo. It often appears under the viewfinder. Take Canon as an example. If the pointer points to 0, the exposure is just normal. If it's left, the photo will generally be dark; if it's right, it's overexposed. At the same time, it should be noted that overexposed photos generally lose details and cannot be recovered, while slightly underexposed photos still have a chance to recover details.

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