What are the advantages and disadvantages of large aperture of lens in various occasions?

1, the scenery in the viewfinder will be much brighter with a large aperture lens. 2, can adapt to a wide range of light, and can shoot good works when the light is not good. 3, it can improve the shutter speed and better condense dynamic objects. 4. Better blur the background and highlight the subject. Second, the shortcomings of "large aperture": 1 First of all, pay attention to accurate focus when shooting with large aperture. When using a large aperture, the depth of field is usually very small. As long as the focus is slightly careless, it may cause focus deviation, which is also commonly known as defocusing. If there is no focus, a work is undoubtedly a failure. 2. Secondly, the aperture is too large, and the difference between reality and reality is too large, so it is impossible to faithfully restore the panoramic view of the scene, which is not conducive to scenery and documentary photography. Some friends took cameras and went to many places. As a result, they found that the things they shot were always worse than others, and there were problems in definition and depth of field, but they didn't know that this was caused by the large aperture they were pursuing. 3. In addition, large aperture lenses are usually bulky and heavy, and the price is unacceptable. Say the weight first. Large aperture lens is not only bulky and heavy, but also inconvenient to carry. When traveling, it is important to minimize the load. Too many lenses will inevitably cause inconvenience in action, and in landscape shooting, it is often impossible to use too large an aperture. Look at the price again. Due to the production process, the cost of the lens will increase considerably every time the maximum aperture is enlarged, and not only the lens itself is more expensive, but also the accessories such as UV mirror and lens cover are much more expensive. Because the price is quite expensive, ordinary consumers simply cannot afford it. Even if enthusiasts bite their teeth to buy one and buy such expensive things, naturally we should be extra careful. If something happens to the camera, will you be less happy? 4. As far as the background blur with large aperture is concerned, we can also get the blurred background by adjusting the focal length of the lens and changing the distance between the camera and the subject. Although a large aperture is good, we don't have to rely entirely on it. ——————————————————— At present, the maximum aperture of civilian lens is Leica 50mm F/0.95 lens! ————————————————————————————