The practical Photography course teaches you to find the best aperture of the lens

Before we discuss this issue, we have to understand what is the reason for deciding whether a photograph is clear or not? There are two main, one is the accuracy of focus, the second is the sharpness of the picture. Sharpness, sometimes called sharpness, is an indicator of the clarity of the image and the sharpness of the edges of the image. If the sharpness is increased, the details of the image are also higher and appear clearer. For example, in the case of Gao Rui degree, not only the screen face wrinkles, spots more clearly, and the face of the muscles of the bulge or sunken also can be lifelike.

According to the physical structure of the lens, if you want to make the screen to produce very clear, very sharp feeling, it is appropriate to reduce the aperture, such as the right figure F/9, the pointer and the dial contour, the edge of the clock and the background of the edge of the grass is also very clear; the left figure f/3.5, although it can form the effect of the But you will find that the entire dial has lost its sharpness, making the pointer and the dial seem to stick together. This means that the aperture of the lens can affect the sharpness of the screen, which is important, and we will continue to explain it next.

　　

Get to know your shot.

To facilitate the beginner's understanding, we use an entry-level zoom lens as an example. As the Canon 18-55mm zoom lens, the logo on the front of the lens shows that the maximum aperture of the lens will change due to the focal length, and the range of changes is between f/3.5 and f/5.6. When we try to find the best aperture of this lens (meaning that the picture taken at this aperture is the best sharpness), we can follow a domestic rule, first find the maximum aperture of the lens, then narrow the two-level, F/7 may be the best aperture of the lens.

This is because aberration increases dramatically as the aperture increases, making the image quality worse. In addition, the aperture is too small will produce diffraction phenomenon to reduce image quality. Therefore, the best aperture value is to avoid the above two appearance of the balance point, that is, the maximum aperture value of one to two levels.

　　

However, the best aperture is not an absolute value, but a range, from the best aperture to the smaller two-file aperture may be caught to the highest sharpness of the image, so for example, the best aperture range of the lens is F/7 to F/10. The results from experience are not necessarily accurate, so you can simply test them, but if you want to test, you have to learn to use Aperture priority mode.

In order to facilitate the novice's learning, we first briefly explain the use of Aperture priority mode, veteran of this paragraph can be ignored.

　　

To switch the camera to aperture priority mode, simply turn the turntable to AV (or a), and by adjusting the dial, you can adjust the aperture values you set on the camera.

　　

　　

Use Aperture priority mode

Aperture priority mode allows you to actively set the aperture size, through this adjustment, you can more intuitively grasp the picture sharpness and aperture size of the relationship. Also, because Aperture Preference mode adjusts the appropriate ISO and shutter speed according to the aperture you choose, it is very easy to use.

MYTH: You may have heard the idea that the lens will be clearest when the minimum aperture (such as F/16 or F/22) is in the picture. In fact, this is a misunderstanding, because the size of the aperture is not only determines the sharpness of the screen, it also determines the depth of the scene, the above sentence only proves that the smaller the depth of the aperture (focal length unchanged), that is, so that each part of the screen is correct focus, so it looks more clear.

Focus accuracy is not equal to sharpness, although both can bring a clear visual feeling, but only choose the right aperture to make your picture more sharp.

　　

　　

By carefully observing the pine needles and the projected shadows, we find that the edge of the F/22 is more viscous and fuzzy than the edges under the F/9. This means that the smaller the aperture is, the sharper the screen will be.

Looking for the best aperture of the lens

We started to test the best aperture of the lens and needed to use the tripod to eliminate the blur caused by the camera jitter. First, adjust your camera to aperture priority mode, fix it on the tripod, and then locate a suitable target (preferably with foreground and background) and shoot in descending order of aperture size.

　　

Finally, upload your photos to the computer and zoom in on the monitor, so that you can quickly see the difference in sharpness at different aperture.

　　

　　

This is a little girl shot in natural light, as long as the best aperture of the lens, even in the low lighting environment we can still get sharp beautiful picture.

Don't overdo it.

Through some of the above explanations, I believe you have been able to find the best aperture of your lens. Keep in mind, however, that sharpness is not the higher the better. If sharp through high, it will appear in the dark edge of the screen white border, the image looks distorted and dazzling, visible, sharpness can improve the visual clarity of the screen, but excessive sharpening will make the photo out of shape.

The most important thing is to find a suitable sharpness for the screen, I hope you can gradually grasp this in the process of their own shooting!

　　

Photography actually brings us a kind of pursuit of a beautiful life, because want to film more beautiful, so will go to explore and search. The above is a tutorial network small series for everyone carefully collected content, hope can be a beginner photography friends benefit Oh.