What do Av and Tv on the digital camera mode dial mean, and what are their functions and uses?

After we first determine the aperture f value, the camera metering system automatically selects the appropriate shutter speed to match the correct exposure based on the light conditions at the time. Aperture priority mode is suitable for photography that values ??depth of field. Some specific subjects require aperture settings to determine the shooting effect. For example, architectural photography and landscape photography require clear expressions from the foreground to infinity, close-ups of portraits or other subjects that highlight the subject. A blurry foreground or background is needed to accentuate the subject. Regardless of the lens function, the choice of aperture becomes the most important factor. When using the same lens, aperture is the decisive factor in choosing the depth of field range. Many people don't pay enough attention to aperture when taking pictures because most people's evaluation criteria for a photo is first of all its clarity. Blurred photos do not express information accurately, thus affecting people's acceptance of it. In order to ensure the realization of clarity, the natural AV mode becomes the first choice when taking photos. If you have more creativity in the expression language of photos, you might as well try out a few more methods. The use of AV mode will give your photography works one more way to express the artistic language. Tv: In shutter priority mode, after we first decide the shutter speed, the camera metering system automatically selects the appropriate aperture f-value (can be a stepless f-number) according to the light conditions at the time to match the correct exposure. Shutter priority mode is suitable for photography that requires shutter control. For example, a high-speed shutter can be used to condense high-speed moving objects. For example, if you shoot the moment of an airplane landing at a speed of one thousandth of a second, you can see the deformation of the tires and the splashing rubber particles caused by the friction between the tires and the ground. Use a slow shutter speed to turn a moving vehicle into a beam of light.