After the light from the SLR camera passes through the lens and reaches the reflector, it is reflected to the focusing screen above and forms an image. Through the eyepiece and pentaprism, we can see the scenery outside in the viewing window. ?
The light passes through the lens and is reflected by the reflector into the frosted viewfinder. Through a convex lens and reflected in a pentaprism, the final image appears in the viewfinder. When the shutter is pressed, the mirror moves in the direction shown by the arrow, the mirror is lifted, and the image is taken on CCD or CMOS, which is consistent with what is seen on the viewfinder screen.
Extended data:
Advantages of SLR cameras:
1, it only has one lens, which is used for both photography and framing, so the parallax problem is basically solved.
2. Single-lens reflex camera can be changed to various matching wide-angle, medium-focus, telephoto or zoom lenses at will, and close-up lenses, extension rings or telescopic leather cavities can also be installed on the lenses as required.
Disadvantages of SLR cameras:
1, heavy and inconvenient to carry.
Because the mirror and pentaprism of SLR camera are essential, the fuselage can't be made smaller.
2. Mechanical vibration and noise
When the reflector is working and the shutter curtain is opened and closed, most SLR cameras are noisy and cannot be used in some quiet environments.
3. What you see is what you get.
Because framing is through the lens, although what you see is what you get, framing is also restricted by the lens, and the brightness of the field of vision is greatly affected by the lens. When using a lens with a relatively large maximum aperture, the viewfinder may be bright, but when using a lens with a relatively small aperture, the field of vision will be dark.
4, the operation is complicated
5. A lot of capital investment in the later period.
6, need to pay special attention to cleaning and maintenance.
Baidu Encyclopedia-Single-lens Reflective Camera