What is a DSLR camera and what are its special features? What is the difference between a DSLR camera and a regular camera?

Framing light from the subject through the lens focusing, the oblique reflector is reflected to the focus

screen image, and then through the top of the ridge of the "roof prism" (Note) reflection, the photographer through the framing eyepiece

can observe the scene, and up and down, left and right with the scene of the same image, so it is very convenient to focus, focusing.

Photography, the reflector will immediately pop up, the lens aperture automatically contracted to a predetermined value, the shutter opens to make the film

sensitive; after the end of the exposure the shutter closes, the reflector and the lens aperture reset at the same time.

Single-lens reflex camera can be used with a variety of wide-angle, medium focal length, telephoto or zoom

lens, can also be installed in the lens according to the needs of the close-up lens, plus the extension of the ring or telescopic skin cavity. In short, the camera is capable of capturing anything that can be seen clearly through the viewfinder. The use of 120 film simple single-lens reflex camera generally do not use a pentaprism (such as the Great Wall DF-4 type), can be directly in the hairy glass framing,

focus; medium- and high-grade single-lens reflex camera can be replaced with a top-down viewfinder viewfinder (such as the Pearl River S-201,

Nikon F3), and therefore can be like a two-lens reflex camera as low as the tilt or inverted Framing.

This is one of the reasons why single-lens reflex cameras are gradually replacing dual-lens reflex cameras.

The disadvantages of the single-lens reflex camera are: the increase of the reflector chamber and pentaprism, the body is taller, thicker,

weight increase; the reflector pops up the moment there will also be mechanical vibration and noise; from the press of the shutter release button to the start of

the shutter interval is slightly longer than in other cameras; the use of a small-diameter lens in the poorly-lit environment of the

scene and focusing, will be the first time in the world that the camera has been used to take a picture of the scene. p>viewing, focusing, will be difficult because of the darker viewfinder screen, easy to cause focusing errors. Therefore, some foreign news

journalists and picked up a flat view framing, double shadow focusing camera, they believe that this camera is small and lightweight,

framing bright focus quickly, easy to grab the shot.

Card digital cameras

Card cameras do not have a clear concept within the industry, and refer only to those whose small form factor, relatively lightweight body, and ultra-thin, stylish design are the main criteria for measuring such digital cameras.

Key features:

Card digital cameras can be carried around without being cumbersome; they can be placed in suit pockets on formal occasions without falling out of shape; they can be squeezed into women's purses; and they can be tucked into jeans pockets or hung around the neck on other occasions.

While they are not powerful, the basic exposure compensation is still standard on slim digital cameras, and with area or spot metering modes, these little things can still accomplish some photography at times. At least you have some basic control over exposure, and with options for color, sharpness, contrast, and so on, a lot of great photos can come from these little things that the "masters" don't see.

Difference between card cameras and other cameras:

Pros:Stylish appearance, large LCD screen, small and slim body, easy to operate.

Disadvantages:Manual function is relatively weak, large LCD screen consumes more power, lens performance is poor.