What's the difference between AF-A\AF-S\AF-C on the camera?

AF-A: This mode is actually a combination of AF-S and AF-C. The machine will judge for itself whether you need to focus with AF-S or AF-C. ..

AF-S: After focusing with the shutter half pressed (not released), if the composition is re-composed, the machine will not re-focus. To put it bluntly, it is often said that "focus first and then compose music."

AF-C: motion focus mode. After the shutter is half pressed to focus (not released), the composition is completed again. As the focus has changed, the machine will refocus. This mode mainly shoots moving objects, such as moving cars. When your lens is chasing a car, the focal length changes at any time, so you need to stay in focus until you press the shutter.

Brief introduction: A camera is a kind of equipment that uses the principle of optical imaging to form an image and records the image with a negative. This is an optical instrument used for photography. In modern social life, there are many devices that can record images, all of which have the characteristics of cameras, such as medical imaging equipment and astronomical observation equipment. After the light reflected by the shot scene is focused by the camera lens and the shutter that controls the exposure, the shot scene forms a latent image on the photosensitive material in the camera box, and forms a permanent image after being developed and fixed. This technology is called photography, which is divided into general photography and professional photography.

Classification: There are many kinds of cameras, which can be divided into landscape camera, printing camera, document microfilm camera, microscope camera, underwater camera, aerial camera, high-speed camera and so on. According to the size of photographic film, it can be divided into 1 10 camera (picture 13× 17mm), 126 camera (picture 28× 28mm) and 135 camera (picture 24×/kloc).

Structure and components: Generally speaking, the main components of a camera include: imaging components, darkroom, imaging media and imaging control structure. The imaging element can perform imaging. A lens group usually made of optical glass is called a lens. Small holes, electromagnetic coils, etc. They all play the role of "lens" in specific equipment. The imaging medium is responsible for capturing and recording images. Including negatives, CCD, CMOS, etc. The darkroom provides the connection between the lens and the imaging medium and protects the imaging medium from interference. The control structure can change the way of imaging or recording images to achieve the final imaging effect. Aperture, shutter, focus control, etc.