As you know, a large aperture can produce a shallow depth of field effect, that is, it can perfectly blur the background and highlight the subject. Because when some photographers get a lens with a large aperture similar to F1.2, they use the maximum aperture to take a shot, and then find that the focus is already accurate. Why is the focus of the subject blurred?
The reason why the aperture can blur the background is because the aperture will affect it Depth of field, the image within the depth of field is clear when shooting, while the image outside the depth of field will be blurred. If you use a large aperture to shoot, the depth of field will be very shallow, so that you can take photos with clear subjects and blurred backgrounds. In addition, the focal length, the distance between the subject and the background, and the distance between the subject and the camera will all affect the depth of field effect. Therefore, the use of a large aperture does not necessarily cause the subject to clear the scenery, but also to consider the other two elements and make adjustments.
The shallow depth of field brought about by the large aperture, it is simple and fuzzy If you change the setting, even the subject will be blurred, so it is necessary to pay attention to the focus position when taking a photo. A slight movement will cause the right and wrong focus and destroy the good photo. For example, when taking a portrait, the main focus is usually the eyes of the subject, and the single-point focus will be more accurate.
You can also use manual focus instead of auto focus. MF button, this is manual focus, it is operated with the focus ring during operation to ensure that the subject is clearly imaged.
So in general, it is because the depth of field is too small, it is not that the maximum aperture of F1.2 cannot be used. This is also the advantage of the lens. It’s just that if you don’t have a solid foundation in photography or a firm hand like an iron hand, you can reduce the aperture appropriately, such as F2-2.8. Unity can also bring good background blur performance, and the focus can be more clear than the maximum aperture Shooting success rate.
Author:SINA,If you need to reprint,please indicate the source:http://www.todaycamera.com/camera-news/why-is-the-photo-blurry-anyway-when-using-the-maximum-aperture