For example, when there is a tree opposite the camera, the rays reflected from the top of the tree will be reflected at a downward angle to pass through the hole in the front of the camera down to the bottom of the back wall inside, and thus the image appears upside down inside, and the size of the image shown inside the camera depends on the distance The hole and the back wall of the camera.[2]
One of the Iraqi scientists made what was later called the mysterious camera; which displays images of objects inside a closed, dark room, and also upside down, but it can not keep what was photographed, but only display it, until the French scientist Joseph nicefor in the nineteenth century was able to keep a picture taken using the camera.[3]
For a single-lens reflex digital camera
A single-lens reflex digital camera consists of (In English: Digital Single Lens Reflex cameras) From the body of the camera it records the image with a removable lens, which gives the user the possibility to change it at will, possessing an optical viewfinder (In English: optical viewfinder) Which allows the camera's clarity to be focused on the object to be photographed when the lighting is poor, and this type of camera is designed to enable the user to see
Mirrorless camera
The mirrorless camera is awarded (In English: Mirror less cameras) All the features of the previous Type, but they are smallersize, lighter, without affecting the quality of images, with the possibility of manual control of all settings in addition to some automatic or semi-automatic modes, some cameras include high-resolution video options, but some models of them do not allow switching lenses, or give limited options for lenses, and there may be a slight gap Between the image on the monitor and what is already in front of the lens, and it may happen