One, the largest aperture
The true value of the maximum aperture is the increase in the amount of light under low light conditions to achieve the best exposure combination. Shooting scenery generally does not require the ability to blur the lens. In addition, the lens aperture is generally not critical except in a particularly dark place. However, when a 70-200mm zoom lens is equipped with a 2x teleconverter and the telephoto focal length becomes 400mm and autofocus is performed with AF, it is best to select a lens with a maximum aperture of F2.8. A large aperture facilitates accurate focusing in dark conditions. Shooting people with a large-calibre lens allows the handheld to shoot with natural light even in low-light areas. In addition, a lens with a large maximum aperture can bring about a faster shutter speed, so sports photography also requires a large-calibre lens.
Second, the focal length
Choosing the lens The first thing to notice is the focal length of the lens. The focal length is actually the angle of view and the focal length is different. In addition, users should make it clear that what is the main purpose of my purchase of the lens? Is it for shooting scenery or shooting people? As we all know, it is appropriate to use a wide-angle lens for shooting scenery, and the telescope head should be used to shoot people, so we must first determine the focal length of the lens to be purchased according to the purpose of photography.
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