Scientists and engineers have lowered the technical threshold for photography, making it accessible to all and requiring little technical knowledge to do a good job. Digital Photography Concise Entry Digital Photography Concise Entry Course Scientists and engineers have lowered the technical threshold for the subject, making it accessible to all and requiring little more than great skill to get a good shot
Let's start with the main technical factors that determine a photograph: A concise introduction to digital photography Digital photography
1. Light. There is no way to shoot without light, and of course there are special equipment that can be taken at night, such as infrared photography, which most people don't encounter. Remember, the first factor that affects photos is light. Adequate light is good for taking pictures, noon is better than evening, and day is better outdoors than indoors. A brief introduction to digital photography
2. Shutter. Also say shutter speed, speed. In fact, a concept of time, expressed in terms of time. For example, 1 / 125, 1 / 8 seconds. This action of the camera is to open the door into the light, 1 / 125 seconds is the door opened 1 / 125 seconds closed, much faster than the general speed of the door, because fast, so called shutter.
3. Aperture. Is the hole into the light. It in the lens, you can open large, you can open small. General use F + numbers, said aperture size, such as F8, F5.6, F22. Damn, the larger the number, the smaller the hole. Digital Photography concise entry-level tutorial simple digital photography scientists and engineers to reduce the technical threshold of this matter, everyone wants to take a good shot
4. Sensitivity. This thing refers to the speed of film sensitivity, some sensitivity, fast. Some delay, slow. With ISO. For example, ISO50, ISO800, the smaller the slower.
The camera takes a certain amount of light to take a picture. The combination of shutter, aperture, and sensitivity is achieved. Understandably, how long the door is open determines how much light comes in, and the process is called exposure. Of course, the light must be on film or on the CCD of a digital camera (which is the equivalent of film), so the sensitivity of film is one of the key to reducing the threshold of digital photography technology.
Shutter + aperture + sensitivity = amount of light.
For example: (Shutter) S1 / 125 + (Aperture) F8 + (Sensitivity) ISO100 = Accurate amount of light.
So, (shutter) S1 / 60 + (aperture) F16 + (sensitivity) ISO100 = the exact amount of light.
That is, twice as much time, twice as small a door, and still the same amount of light.住，
Alternatively, (shutter) S1 / 250 + (aperture) F8 + (sensitivity) ISO200 = the exact amount of light.
That means twice as little time, the door stays the same, the sensitivity doubles, the amount of light is still right. Now you've got to figure out that the shutter, the aperture, the sensitivity, you can all change, you can always get the right amount of light.
Or, Digital Photography Concise Getting Started Tutorial Digital Photography Concise Getting Started Tutorial Scientists and engineers lower the technical threshold for this matter, everyone can shoot it, and only a little technical knowledge is needed to get it right. First of all, the main technical factors that determine a photo:1. Light without light can not be taken, and of course there are special equipment that can be photographed at night, such as infrared photography + these people generally do not get a good enough to know how to get it.
Autoexposure digital photography
that would not calculate very dizzy?
No, it's just easier. Now the cameras are all about auto-exposure, which is about automatically calculating the amount of light needed. Cameras usually have modes, like auto-AUTO, where you don't have to worry about anything. Feel the light yourself and figure out the right set of aperture and speed. We can have a little more control than automatic, like TV mode, which is speed first, and you pick this mode, and then you pick a shutter speed, and it always decides the right aperture at that shutter speed, so it's called speed first, shutter first, and speed first.
And the AV you're familiar with, not the Japanese AV, is the aperture priority, you set the aperture, the camera counts the shutter speed. By the way, underexposure, overexposure, are two common terms. Black lacquer is insufficient, white flower is excessive. In the digital age it's basically not a problem, just take a few more shots with different exposures.
Exposure is based on metering
So how does the camera calculate the amount of light? Through a device called metering. How bright the light is can be measured, or the production of the camera is messy. Cameras are all internal metering, that is, measuring the picture seen by the viewfinder, how bright the picture is. So, boss, you can immediately conclude that it is reflected light, it is under light, different objects are not reflected by this light. Many people rely on automatic metering to shoot the snowscape shot is gray, shoot the coal plant shot is not black, is the reflectivity of the problem. So the boss must have thought, there must be a more reliable metering equipment, right, measure the incident light. That is to measure the brightness of the light source, this thing is accurate. An incident light meter is a standalone device, like a stopwatch or a sphygmomanometer, that doesn't fit in the camera because it doesn't work inside, the camera is closed and there's no light in it, and it doesn't work outside because you can take pictures far away from where you're standing, and they don't have the same lighting conditions. The main thing is that it's a professional piece of equipment, and it's not particularly strong. It works the same way as an auto exposure, you can set an aperture and let it measure the shutter speed it needs.
Since we talked about speed, aperture, sensitivity is a set of values, and sensitivity does not need to change. Speed, aperture, with what priority? Aperture priority or shutter priority?
The speed is too slow, the camera is unstable, the image is distorted. Usually, less than 1 / 30 second is very difficult to stabilize. Yes, it is difficult to maintain the stability of that period of time, which is beyond imagination. Similar to shooting events, it is difficult to maintain stability without practice. Slower shutter speed, such as 1 second, can not be practiced. But the size of the boss is naturally good stability, should be able to take a very slow shutter speed. Why not high-speed shutter? When the light is limited, the door opened the most, but also to open a little more, which is the last resort. Tripod is used to do this, to maintain stability. To sum up, shutter priority is usually bad, but people who do sports may use it a lot. By the way, the subject is fast, and a slow shutter doesn't freeze the moment. The relationship between the movement of the subject and the shutter speed determines the effect of the picture: For example, take a waterfall, use slow speed, 1 / 30 second, shoot out the waterfall like fog like rain and like wind, very light. Because:
Waterfall Motion Speed > Shutter speed. In 1 / 30 of a second, the waterfall may have jumped 10 meters, and the motion projected onto the film is imaginary.
Instead, shoot a waterfall at high speed, say 1 / 5000 of a second, the speed of the waterfall so it looks like a solid, it looks like it could kill a person.
Aperture priority / focus / depth of field,
Apart from the fact that the speed of the subject's movement matters. The most important means is your favorite AV, the aperture takes precedence. The aperture takes precedence is more important, more commonly used, and besides being the same name as the AV, another extremely important reason is the depth of field. This is a simple way to understand the focus: the camera does not make the subject clear in the photograph, it ensures that a point is clear, and that point is the focal point.This point is not about the left and right, but the front and the back, which is a concept of depth. Depth of field The concept of depth of field around the focus, that is, before and after the focus, there is a little further and a little closer space can be clear, this clear distance is the depth of field, the spatial depth of the scene. In general, the focus behind a little more clear distance, less in front of a few.
This depth of field is closely related to the aperture, is an optical problem, just remember not to understand. Large aperture depth of field is small, small aperture depth of field. F2, depth of field is small. F32, depth of field is large.
I just want to get a good shot of the focus and what do I care about depth of field? Using depth of field can blur out the clutter you don't want and highlight the subject. It matters. The camera has no heart and no lungs. It usually sees too much and is messy. The boss can use depth of field to filter it. And the mechanical indicator that determines depth of field is the lens:
1. Long lens, is the telescope, cannon, depth of field small. See Tiger Zhou works.
2. Short lens, is the wide-angle lens, depth of field. See CGX works.
3. Macro lens, depth of field smaller.
This has to talk about the camera.
1.Wide angle lenses. Large scenes can be shot at close range. CGX photography distance is too close for long lenses.
2. Long lens. Equivalent to binoculars, sports games and leadership meetings can only be shot from afar, so a line of cannon on the sidelines. It is best to take the camera to go to the camera shop and twist the lens one by one.
The lens has a single function, fixed focus. Can not pull the distance, can only rely on your own running back and forth. For example, 24 wide-angle. 300 telephoto, single function, but the workmanship and quality must be good, aperture large, F for example 1.2. There are also zoom lenses, such as 35-200, both wide angle can be long focus of the boss, do not you run back and forth, not back a bunch of lens is not the most likely to do the focus on the equipment.
1.Take more pictures. The digital camera is not afraid to take more pictures. Set different values, shoot immediately to the computer to see the difference at a glance. Don't look on the camera, the details can not see. The biggest contribution of the digital camera is the immediate results, the liberation of memory, in the zero-cost exercise, it is easy to master the right way.
2.In addition to the flexible AV, the exposure compensation function is most commonly used. In fact, unlike the literal meaning, is not a complement, is an increase or decrease in the meaning of the shutter and the light ring in addition to fine-tuning the exposure compensation.
3.Granular sense. Sensitivity is related to granular sense. The higher the photosensitivity, the larger the granule, sometimes the granular feeling is very beautiful.
4.Color temperature. It's a matter of the color of the light source. Now it's also called white balance on digital cameras. Usually you can choose sunny days, cloudy days, incandescent lamps, fluorescent lamps and so on, because these light sources have different colors. Try setting the fluorescent lamp instead of incandescent lamp under the fluorescent lamp and the photo comes out very cold. This brings up the last problem.
Photography is subjective, reproduction does not exist at all. Techniques are designed to control the proximity of images to subjective feelings, be more subjective.