Three elements of exposure for SLR photography
Some "photography enthusiasts" often ask me, how to get a good photo, canvas factory or let me pointed out problems and solutions of their work, then I speak a lot of I think is easy to understand the knowledge and experience to them. Often the result is they can't understand! Afterwards, I found some friends did not even understand the basic knowledge of photography, so he is difficult to understand what I said. As a result, the share of photography will start from the most basic knowledge. Wish I could help people who love photography and love to learn!
First of all, we mainly to share today is the "light" in photography, canvas prints australia so what is called exposure? The sensor is to make the "film" or "photography" photographic exposure is called. So to get the right exposure photos, must understand that three main factors determine exposure. So what is the exposure of the three elements? Is what we call the aperture, shutter speed and ISO (ISO)? In this paper, the next will be with all of you to get to know these a few elements, as well as the relationship between them.
- the aperture
Aperture size: I don't know what a "failure" god began to identify the size of the aperture to the opposite ha (a joke). We often say that the large aperture and small actual identity out of numerical aperture and the camera are reversed, such as: f16 is a small aperture, and f is the large aperture. This must figure it out, don't understand the! Aperture of the two functions: one is control into the light. The larger the aperture, the greater the area of the light can pass (pictured), into the greater the amount of light.
Then the second effect very good understands of: control the depth of field. As we often say others background (or foreground). About the "depth" we will share in the next section and tell you in detail.
- the shutter
Aperture is through the small hole open wide open to control light into the light, the shutter is through hole into the light switch control the length of time, to control the amount of light. Hole open the longer, the more light into. Identification of the shutter speed and actual speed is consistent, 1/1250 of a second shutter faster than the shutter of 1/60 of a second, it is easy to understand, not much said. The faster the shutter, the more likely they were to condensation high-speed, such as water droplets. The slower shutter speed, holding the easier it is for jitter caused by image blurring. So in this share a theory of the shutter, is "safety shutter theory". "The Security Shutter" is the reciprocal of the focal length you use. If you use the focal length is 50, then you safe shutter speed should not be less than 1/50 of a second.
Shutter also have a second role, and aperture, is also a charming, belong to the SLR unique charm, it is slow. Slow shutter speed to a certain extent, the location of the moving objects can be in different repeated imaging points will be projected onto the camera light, let the water form a smooth effect, make the clouds silks and satins, let to sway, flowers form a dynamic virtual shadow walk people leave tracks, the lights of the car had formed the flow of light….
ISO, ISO. Friends all know that used film has different sensitivity. Sensitivity is also the concept of the digital camera, but we can adjust, and we buy film, iso has been fixed, have no choice. Sensitivity refers to the sensitivity to light. The higher the sensitivity means that is sensitive to the light. When you take pictures in a dark environment, then the light appeared obvious shortage, we can pass the high sensitivity, to realize the normal exposure, but there is a weakness of the (light is dark, the bigger the iso open, the more serious the image noise), especially when we enlarge the picture. So, the light is good circumstances, the minimum numerical general Settings for the camera.
Of course, as technology continues to develop, and now the market is high-end cameras in some of the high sense of performance has been very strong. Practitioners to our photography enthusiasts, brings a lot of convenient. If you have high requirements on the image, then I suggest you use the tripod and slow, to achieve your normal exposure.
(4) the relationship between the aperture, shutter speed, ISO
For us to understand the relationship between them, the face of all kinds of light and shade environment how to handle the normal exposure is quite important. When we face a scenario, the need for metering, the required amount into the light of actual is a fixed value, but the numerical aperture, shutter speed, ISO, and camera have relations, accurate exposure is fixed, but all can be adjusted, therefore, must shift, to ensure that the total exposure of the same. The relationship between the aperture and shutter: reverse. The larger the aperture, into the greater the amount of light, the shutter switch time is shorter, the faster the shutter, so into the light would remain unchanged. The aperture and ISO relationship: reverse. The larger the aperture, because there is plenty of light, ISO can keep the smaller, into the light remains the same. Shutter speed and ISO relationship: positive. The smaller the faster shutter, into the light, the ISO need to increase to ensure adequate sensitivity.
Summary: this article says the correct exposure, that is, making the image seems appropriate. For images and looks to the naked eye, white is white, gray ash, black. Without regard to photographers deliberately add and subtract exposure to so as to achieve the desired effect of interpretation (as usual said "high" and "low key"). Everyone a good mastery of the exposure, only can use manual mode, can according to different photography subjects make different effect. Finally, I hope you have time to practice, then please continue to focus on our next to share, to continue to support us, welcome to the exchange, photo on canvas have what good advice can you give us a message, thank you for your attention!