How to find your best aperture lens
Sometimes look very clear photos enlarged is hazy, do you have for canvas prints pictures detail fuzzy vexed? In fact, this is the lens sharpness. Today we have to be solved for you, what is the reason lead to the result, and how to avoid the happening of this kind of phenomenon, help you little detours, and break through this difficult problem!
Before we discuss this problem, we understand that to determine whether a photograph in a clear reason for that? Basically has two, one is the focus of the accurate; the second is the image sharpness. Sharpness, sometimes referred to as “resolution”, it reflects the image clarity and an index of the image edge sharpness. If the sharpness increase, the detail of the image contrast is also higher, look more clearly. For example, in the case of sharpness, not only on the face of wrinkles, spots more clearly, and facial muscles will behave under summon or concave lifelike.
According to the physical structure of the lens, if you want to make it produce is very clear, sharp image, will be appropriate to reduce the aperture, as pictured, 9 / F, chiseled pointer and dial, the edge of the clock compared with the edge of the background of flowers and plants is also very clear; Left F / 3.5, although can form along with the background of effect, but you will find all the dial lost sharp feeling, make the pointer and dial seem to stick together. This shows that the aperture of the lens can affect the sharpness of the picture, it is very important, we will continue next.
Know your lens, for beginners to understand easily, we use an entry-level zoom lens as an example. Such as the Canon 18 to 55 mm zoom lens, lens in front of the identification of the lens for maximum aperture will change due to the different of focal length, the scope of the change in F / 3.5 to F / 5.6. When we try to find the best aperture of the lens (under the aperture of canvas prints images to achieve the best sharpness), we can follow the rules of a country, first find the maximum aperture lens, then shrink two magnitude, F / 7 is probably the best that the lens aperture.
This is because the aberration will increase sharply with the increase of the aperture, the image quality worse. In addition, the aperture is too small will produce diffraction phenomenon has reduced image quality. Best aperture is, therefore, to avoid the above two is like a balance, i.e. maximum aperture low grade one or two.
Best aperture, however, is not an absolute value, but a range, from the best aperture to the two gear aperture may be younger than the catch to the sharpness of the highest image, so the best aperture range, for example, the lens is actually to 7 F/F /. According to the result of experience it is not necessarily accurate, so you can simple test, but if you want to test, you have to learn to use aperture priority mode.
Simple for beginners to learn easily, we first explain the use of aperture priority mode, the veteran has this paragraph can be ignored. Switch the camera to aperture priority mode, you just need to put the wheel turn to Av (or a file); by adjusting the wheel, you can adjust the Settings in the camera aperture.
Use aperture priority mode, aperture priority mode lets you take the initiative to set the aperture size, through such adjustment; you can be more intuitive grasp of the picture sharpness and the relationship between the aperture sizes. At the same time, because the aperture priority mode will be selected according to you the right to adjust the aperture of the ISO and shutter speed, so also is very simple to use.
Myth: you’ve probably heard a saying – at the smallest aperture lens (e.g., F / 16 / F / 22) will be the clearest picture. In fact this is a misunderstanding, because the size of the aperture is not only decided the picture sharpness, it also decided the picture of the depth of field, these words just proves that the smaller the aperture depth deeper under the condition of invariable (focal length), which is the canvas prints images correctly to every part of the focus, so it looks more clear. Focusing accuracy is not equal to high sharpness, although both can give a person with clear visual perception, but only to choose the appropriate aperture can make your picture sharper. We see the pine needles and the shadows cast down, will find that the edges of the F / 22 under more viscous than the edge of the F / 9, fuzzy. This shows that is not the smaller aperture, the picture will be sharper.
Looking for the best aperture lens, we began to test the best aperture, in order to eliminate camera shake caused by fuzzy, you need to use the tripod. First of all, adjust your camera to aperture priority mode, fixed on a tripod, and then find a suitable target (preferably with foreground and background), taken by diminishing the aperture size in the order. Finally, put your photos uploaded to the computer, use the display magnification, in that case, you can quickly find the sharpness of the difference under different aperture.
Through some of the above explanation, I believe you have been able to find your lens aperture. But remember, the higher the sharpness is not the better. If the sharp through high, may be on the edge of the picture of dark appear white edge, image distortion and look dazzling, visible, sharpness can improve the image visual clarity, but excessive sharpening will lose the shape photo. The key is to find the right picture sharpness effect, hope you can in the process of gradually mastered it!