What's the matter with the thermal imaging image coming?

There is a pentaprism inside the SLR camera. Pentagonal prism is a reflection device of SLR camera, which corrects the left and right reflections on the focusing screen.

The key of SLR camera optical system is composed of a group of complex optical elements. The quality of the optical system directly determines the framing effect and the final imaging effect, so the system adopted by the SLR camera is the most professional reflective system. The optical system of SLR camera is mainly composed of lens system, reflector, focusing screen and pentaprism. In this system, the unique design of the mirror and prism enables the photographer to directly observe the image passing through the lens from the viewfinder.

The pentaprism of a SLR camera is usually made of a whole piece of solid glass by cutting and polishing, and then the outer surface is coated with reflective material to form specular reflection inside. The image formed by the SLR camera is reflected twice by the pentaprism, and its function is to correct the reflection on the focusing screen, so that the image seen in the viewfinder is completely consistent with the scene directly seen, and there will be no reflection.