Can the Nikon d40 LCD screen be used for framing?

The D40 is a digital SLR camera and cannot be viewed through the LCD screen.

Digital SLR camera refers to a single-lens reflex digital camera system, that is, DSLR (Digital Single Lens Reflex). In this system, the unique design of the reflector and prism allows the photographer to directly observe the image through the lens from the viewfinder. After the light passes through the camera lens and reaches the reflector, it is refracted to the focusing screen above and forms an image. Through the eyepiece and pentaprism, the photographer can see the outside scenery in the viewing window. When shooting, when the shutter button is pressed, the reflector will pop up, and the shutter curtain in front of the CCD will open at the same time. The light (image) passing through the lens will be projected onto the CCD to make it sensitive, and then the reflector will immediately recover. In its original state, the image can be seen again in the viewing window.

This structure of the DSLR camera ensures that it is completely focused through the lens. It can make the image seen in the viewing window always the same as the final photo taken. Its framing The range is basically the same as the actual shooting range, which eliminates the parallax phenomenon of range-axis head-up viewfinder cameras. From a photography point of view, it is very conducive to intuitive framing and composition. In addition, a great feature of digital SLR cameras is that they can exchange lenses of different specifications.