What is the dog's head in a SLR camera?

Dog heads are for amateurs and beginners.

First, the dog head in the SLR camera:

The dog head is for some amateur photographers and beginners, and the imaging is average but the price is very different;

There is also a relative saying, tauren, that is, high-end head;

For example, Canon's red circle, Sigma's gold circle and fever-grade Leica Zeiss are mostly constant aperture, ultrasonic motors and large caliber.

Second, the single lens reflection:

This is a single-lens reflex digital camera. This technology is to install a mirror at a 45 angle in front of the film plane.

Frosted glass, pentaprism eyepiece, etc. Above the reflector. The pentaprism reflects the real image light for many times to change the optical path and send the image to the eyepiece, so that the image seen in the observation window is always the same as that on the film, and the framing range is basically the same as the actual shooting range.

The unique design of this prism enables the photographer to directly observe the image passing through the lens from the viewfinder.