SLR camera or card machine

Card machine (that is, side-looking camera)

Characterized in that the viewfinder is located in the machine body beside the lens to aim at the shooting range.

B: You can directly see the range of images similar to those that can be taken on the negative.

C: Generally, this viewfinder only has the function of framing, but has no function of ranging and focusing. However, the advanced viewfinder is equipped with a viewfinder that can focus at the same time, which is convenient for focusing in dim light.

D: Because the viewfinder and the lens are not on the same optical axis, but on one side of the lens, the shooting angles of the viewfinder and the lens are different, so the shot image will be different from the seen image, resulting in parallax, but it can be ignored at a distance of three meters.

E: You can't visually see the depth of field of the picture to be shot through the viewfinder, which is not conducive to the photographer to choose the appropriate aperture according to the exact requirements of the spirit.

SLR camera, referred to as SLR.

Advantages and disadvantages: 1, the lens has both shooting and framing functions.

2, regardless of the difference, this camera has a reflector, reflecting the image produced by the lens to the ground glass of the viewfinder. The image seen on the ground glass of the viewfinder is formed by the same lens used for shooting, so it "ignores the difference"

3. It can adapt to the framing range of lenses with different focal lengths, and the framing is more accurate, and it can adapt to most photography tasks, including close-ups.

4 (Disadvantages): It is heavier and larger than the side-looking camera, with complicated parts, greater possibility of damage and higher price. When shooting, the mirror should bounce up and make a sound, which is easy to be found by the subject due to the vibration of the fuselage and affects the shooting quality, and it is difficult to focus in low light.