The distance between the rear element (the element in the lens that is closest to the camera body when attached) and the sensor is known as the back focus. Interchangeable lenses comprise multiple lens elements. * Since its launch in 1987, the EF mount has been used in constantly evolving autofocus SLR cameras with interchangeable lenses. The mount diameter was decided after holistically considering factors such as resulting camera size, ease of use, sturdiness and reliability, while also taking into consideration the mount’s future potential. It is designed to accommodate lenses with all types of characteristics, such as large aperture f/1.0 lenses, high-image-quality lenses, high-magnification lenses and compact lenses. The RF mount used in Canon's EOS R System has a large mount inner diameter of 54 mm, like that of the EF mount*. The mount of an interchangeable-lens camera is the mechanism that connects the lenses to the camera body. Read More Canon's full-frame mirrorless camera technology (EOS R System) One of the advantages of the optical viewfinder is that the photo subject is shown in the viewfinder as-is and in real-time, so shutter timing can be matched precisely to the subject. This image can then be checked by the photographer using the optical viewfinder. One of the advantages of electronic viewfinders is that the photographer can use it to check settings like the color tone of the photograph before taking a photo, and can easily adjust white balance, exposure and other parameters.Ī mirror inside the camera reflects the image captured by the lens into a component called a prism located in the top of the camera. Light that enters the camera body is used by the image sensor and image processor to generate image data, and this image is shown in the electronic viewfinder. There are major differences between the viewfinders used in mirrorless cameras and SLR cameras.Įlectronic viewfinder (mirrorless camera) The photographer uses the viewfinder to check the image that will be captured. The photographer checks the image in the electronic viewfinder and takes photos.Īs Figure 2 shows, in an SLR camera, light that passes through the lens into the camera body is reflected by a mirror and directly checked using the optical viewfinder when taking photos. 2 (Bottom): Diagram of an SLR cameraĪs the name indicates, while SLR cameras have a mirror, mirrorless cameras do not.Īs shown in Figure 1, in a mirrorless camera, light that passes through the lens into the camera body is converted into an image by the image sensor and image processor. 1 (Top): Diagram of a mirrorless camera Fig. There are two main differences between SLR cameras and mirrorless cameras: the presence of mirrors and how the viewfinder works. How mirrorless cameras differ from SLR cameras
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