Why don't you need a photographic eyepiece?

Viewfinder eyepiece SLR viewfinder eyepiece is the lens above the viewfinder on SLR camera, and part of the image can be monitored through the eyepiece during framing. There are two kinds of eyepieces in SLR viewfinder: pentaprism and pentaprism. Five prisms are used for mid-range SLR and above, and most entry-level SLR use five prisms.

The viewfinder is a part of a digital camera, which monitors the image through the eyepiece. Now the eyepiece viewfinder of digital camera has black-and-white viewfinder and color viewfinder. But for professional digital cameras, they are all black and white viewfinders, because black and white viewfinders are more conducive to photographers to make correct compositions. The viewfinder structure of a digital camera is the same as its LCD screen, both of which use TFT LCD. The difference lies in size and power consumption.