SLR photography skills from entry to mastery

SLR photography from beginner to proficient: shutter, shutter speed, front curtain synchronization, Hou Lian synchronization.

Details 0 1 SLR camera shutter position

The shutter of the SLR camera is on the fuselage, in front of the sensor and behind the reflector. The shooting process of SLR camera is like this. Light will pass through the lens before the shutter is released. After the light is reflected by the reflector, it changes the optical path, and then reaches the viewfinder after being refracted by the pentaprism. The photographer observed the lens through the viewfinder. In this process, you can focus, compose, adjust the aperture size and shutter speed. What the photographer sees is the final image, and what you see is what you get. When the shutter is released, the reflector rises, the shutter opens, and the light directly shines on the photosensitive element for exposure. When the shutter is closed, the exposure ends.

02 louver structure

The picture above shows the mechanical structure of the shutter. The black area in the middle of the picture is a bit like a rolling shutter, which is the shutter of a SLR camera. In fact, the complete structure of SLR camera shutter is divided into front curtain and Hou Lian, and also includes some auxiliary equipment, such as electromagnetic release device and shock absorber. You can see the front curtain directly from the above picture, and Hou Lian is naturally behind the front curtain.

Working process of shutter of SLR camera

Anyone who has used a SLR camera knows that the shutter always clicks when taking pictures. Why are there two kinds of such voices? This is because the shutter is open and the Hou Lian is closed.

When we take pictures, when the shutter is released, the Hou Lian opens from bottom to top, and then the front curtain opens from top to bottom. At this point, the exposure begins. The front curtain clicked when it opened. When the shutter is opened to the maximum and the shutter time ends, the Hou Lian starts from the top.

Close it, and the exposure is over. The sound of Hou Lian's closing process is "click", and finally the front curtain is closed.

The opening and closing directions of the front and rear curtains, one from top to bottom and the other from bottom to top, ensure the same exposure time of the upper and lower parts of the photo.

04 shutter time

Shutter time is also shutter speed. This is a very important setting parameter in photography. Because of the shutter time and aperture size, the exposure accuracy of photos is determined. At the same time, under different shutter speeds, different picture effects will be obtained in photography creation. The high-speed shutter can freeze the instantaneous action, while the low-speed shutter transforms the dynamic effect into the motion trajectory.

Front curtain synchronization and Hou Lian synchronization also refer to flash synchronization.

* Front curtain synchronization

Front curtain synchronization means that the shutter front curtain is completely opened and the flash starts flashing, which is suitable for correctly exposing the subject in low light.

* Hou Lian synchronization

Hou Lian synchronization means that the shutter does not flash when it is fully open, but flashes before the Hou Lian closes.

In fact, the difference between the two flash modes is not very big when the shutter speed is relatively fast, but the difference comes out when the shutter speed is very slow. For example, when shooting a moving object, if the front curtain synchronization is used, smear will appear in front of the moving object, while Hou Lian synchronization is just the opposite, and smear will appear in the rear.

In a word, shutter is a very important mechanical structure, and shutter speed plays a very important role in photography creation. At the same time, blinds have a long service life. Please cherish the shutter in the camera. Please think twice before shooting, and press the shutter after thinking twice, which not only saves your shutter time, but also is a good photography habit.