​Seven common problems about the use of the aperture

Aperture is one of the most important people in the exposure of the iron triangle. You need to adjust the aperture value, canvas prints whether you are using full manual mode or aperture prerequisite. However, many students will encounter some problems when using large aperture and small aperture.

(1)when using a large aperture

Problem 1: the body is not sharp enough

If you've been paying attention to what we've been doing, you'll know that the aperture serves two purposes, one is to control the amount of light coming in and the other is to control the depth of field. When you use a large aperture, canvas online the depth of field before and after the focus decreases. If your camera moves back and forth, it will be easy to move the subject out of the depth of field, blurring it out. On the other hand, lenses tend to soften at their maximum aperture. The more you start with, the worse.

Problem 2: the background is too vague

Have explained, in a question on the large aperture can make becomes shallow depth of field, let the background blur, although this is a very useful skill, but when your aperture is too large, makes the background of the photo is too blurred, sometimes is not good, frames for canvas just think if you go to travel photos all background is also vague, although the photo has a "professional" feeling, but the photo with this cannot show that some places have you visited, so that he lost the meaning of the photo!

Problem 3: overexposure of photos

If you are with aperture priority or manual mode, or the place with enough light in the daytime, the use of large aperture may make your photo image, a "white", especially when you have the highest shutter of the camera is not fast enough (for example, some of the camera shutter only 1/2000 s), or no use ND minus the opportunity will be increased, then you will need a little bit small aperture to solve.

(2) When using a medium aperture

Problem 1: the main body is not prominent enough

When using secondary aperture, background and main body tend to blend together, to highlight the main body, this is because the middle aperture failed to make a shallow depth of field, especially in the background when it's not too far away from the subject, the background will be the same as the main body is clear, and if you do not deliberately looking for simple background, main body is easy to will "disappear" in the photo.

Problem 2: failing to get a shallow depth of field

Failed to keep up with a question, is the medium aperture clap a shallow depth of field, to make a shallow depth of field effect, remember aperture, focal length and the background will have great influence, so if you must use medium aperture and to highlight the main body, please be wary of the background to choose, or a longer focal length and the distance of the background to add a shallow depth of field effect

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(3) When using a small aperture

Problem 1: the photos are not sharp enough

When using extreme small aperture (such as f/32, f/36, etc.), the photo will be due to the scattering of light in physics and become not sharp enough, so although a small aperture will generally make the image better, but too small will be counterproductive, you must be careful!

Problem 2: hand shock

A small aperture will reduce the amount of light coming in. If you are using a hand-held camera, be careful to ensure that the shutter speed meets the "safe shutter speed" standard.

This article mainly discusses the use of different degrees of aperture will encounter problems, although it is a very basic knowledge, panoramic canvas but you students must be careful to pay attention to, make their own use of aperture more sure!