Aperture common sense

1. What is the function of the aperture?

The quality of the photos we usually take is related to the exposure, that is to say, how much light does it take for ccd to get a clear image.

Exposure is related to light passing time (determined by shutter speed) and light passing area (determined by aperture size). Shutter priority means that the exposure value is calculated by the automatic metering system of the machine, and then the aperture is automatically determined according to the shutter speed you choose.

Aperture priority refers to the exposure value calculated by the automatic metering system of the machine, and then automatically decides how many shutters to use according to the aperture size you choose. Manual mode means that you specify the aperture size and shutter speed yourself.

When you have requirements for the shutter, the shutter is the first choice. If you shoot a high-speed moving object, the shutter is definitely faster, so you control the shutter and the camera controls the aperture. It should be noted that the adjustable range of the aperture is smaller than that of the shutter, so when using the shutter for the first time, if the shutter is adjusted too fast or too slow, the camera will not be exposed correctly.

Aperture priority is the opposite. Shutter priority is to manually define the shutter value of exposure, and the camera will determine the aperture size according to this shutter value. Set the camera dial to S, or set the exposure mode to S in the menu, which is the shutter priority function.

Shutter priority is mostly used to shoot moving objects, such as sports, moving vehicles, waterfalls, flying objects, fireworks, water droplets and so on.

2. What can a large aperture bring us?

A large aperture lens can let more light through to deal with the problem of dim light.

Large aperture lens can also get wonderful facula effect when shooting point light source. If the aperture of the lens is large enough, shooting a panoramic portrait at a little distance can still effectively blur and filter out the messy background and get a prominent picture.

According to the following sample, it can be seen that the larger the aperture, the more obvious the background blur effect and the more prominent the main scene. Anyone who has used a SLR camera knows that the numbers and English letters on the camera lens are an introduction to the characteristics and functions of the lens. For example, when we buy a mobile phone, we can know the brand and model of the mobile phone through the LOGO on the back of the mobile phone, and the digital logo marked on the lens also represents the same meaning.

3. Photography common sense parameters of aperture and shutter combination

The combination of aperture and shutter has little to do with the weather, but the combination of exposure has something to do with what you want to express. The simplest example is that portraits are usually shot with a large aperture, which can not only highlight people with a small depth of field, but also capture portraits with a high-speed shutter to prevent the picture from blurring. Shooting a scene requires a small aperture to obtain a greater depth of field and make the whole picture clear and sharp.

You can also try 4 seconds exposure, 1/500 seconds exposure to capture the effect of water flow.

Tell you a common exposure combination: sunny day 16 rule. When shooting a positive object on a sunny day, the aperture is selected at F 16, and the shutter is the reciprocal of the camera ISO (if the ISO is 200, the shutter is 1/200 seconds).

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4. Physical knowledge of cameras Many cameras have "apertures" and "shutters". What do they mean?

Aperture is a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens, usually in the lens.

We use the f value to represent the aperture size. For the manufactured lens, we can't change the diameter of the lens at will, but we can control the luminous flux of the lens by adding a polygon or circular aperture grating with variable area inside the lens. This device is called aperture shutter, which is a device to control the effective exposure time of photosensitive film on the camera.

At present, digital cameras only have electronic shutters and mechanical shutters. First of all, talk about the difference between electronic shutter and mechanical shutter.

The difference between them lies in the principle of controlling the shutter. For example, the electronic shutter controls the shutter time through the principle of controlling the shutter coil magnet by the circuit, and the gears and linkage parts are mostly made of plastic. The principle of mechanical shutter control is gear drive control time, and the linkage and gear are mostly made of copper and iron. The former is easy to be destroyed by wind and sand, and the latter is also afraid of wind and sand erosion, but it is clean and convenient.

The working principle of the shutter is as follows: in order to protect the photosensitive device in the camera from exposure, the shutter is always closed; When shooting, after adjusting the shutter speed, just press and hold the shutter release button of the camera (that is, the camera button), so that the light passing through the camera lens can be correctly exposed between the opening and closing of the shutter, and the light can enter the photosensitive device through the shutter and be written into the memory card. New and enhanced function of character animation tool: Alias MotionBuilder integrating animation, character setting and deformer? Technology and the enhancement of deformers and skinning tools make it faster, easier and more accurate to make character animation.

The role integral IK adds the industry-leading role integral IK solver to Maya, which can assemble and design the pose of the role more quickly and easily, and can realize the natural joints of biped and quadruped. For example, if the user makes an animation of a character reaching out and picking up an object, the torso will automatically move with it.

The same character set can be used in multiple animation scenes, for example, a character from crawling to walking to swinging in a tree. Maya and MotionBuilder have the same solver, which makes the role transfer between the two software packages easy without losing data.

Replace Geometry Users can now replace boundary geometry with different geometry and still maintain skin weights. This added feature saves time by eliminating the time it takes to recalculate the character's skin weight many times.

This is beneficial to parallel workflow. In parallel work, modeler, animator and technical director work in the same role at the same time, and have some new functions. For example, when taking photos, people want to freeze the most natural and beautiful moment of their laughter, but the reality often backfires. Either you can't become a "peach blossom" in front of the camera, or your face is frozen with laughter, and the photo taken is still a bitter gourd face with a smile.

A digital camera that has just been listed recently can capture "instant smile" and automatically press the shutter. Users can choose the facial expression they want the camera to "spy", whether it's a shallow smile or a grin, they can do whatever they want.

Of course, when this function of the camera is turned off, it can return to an ordinary camera. EK- 100 aperture priority automatic exposure camera: there are some new functions. Automatic exposure; 2. exposure compensation; 3.AEL exposure memory lock; 4. Electronic * * *; 5.DX code check; 6. The shutter effective exposure time data display and exposure warning function; 7. Aperture value display.