Is Canon 500D a full-frame camera?

Camera photography requires photographic materials to record images. The photosensitive material of traditional camera is film, and the photosensitive material of digital camera is photosensitive element (CCD or COMS). Relative to the area of 35mm film, the size of the photoreceptor is Quan Huafu. If it is close to or equal to it, it is a Quan Huafu SLR camera. For example, the film size of traditional 135 camera is 36×24mm, and the CMOS size of Canon EOS-5D digital SLR is 35.8×23.9mm, which is close to the size of 36× 24 mm, so Canon EOS-5D belongs to Quan Huafu digital SLR. Because the photosensitive area of full-width SLR is equal to or close to 35mm film, the focal lengths of various lenses are the same as those of traditional cameras. Based on the existing manufacturing technology and process level, it is difficult and expensive to manufacture large-size full-width photosensitive elements, so most photosensitive elements used in digital cameras are not full-width, and the size is between 135 camera negative and household digital photosensitive elements, and the most common one is "APS-C" specification. Due to the widespread use of 35mm film, 36×24mm has become a specification. Under this specification, 35mm has become a standard for us to judge the lens angle. For example, 28mm lens can achieve wide angle, 35mm is the standard angle of view, 50mm is closer to the human eye angle and so on. However, in the digital age, the photoreceptors used in digital SLR cameras are more than 36×24mm, so there is a problem of magnification. For example, APS-C size, magnification 1.5 (Canon1.6); 4/3 system, magnification 2; Sigma X3 system, magnification1.7; Canon APS-H size; The magnification is 1.3, etc. Take Canon EOS 400D(APS-C format) and a 18-55mm lens as examples. Multiplied by the magnification of 1.6, the equivalent focal length of the lens on the camera will become 28.8-88mm, but if the Quan Huafu SLR is matched with 18-55mm lens, its focal length will remain unchanged. Therefore, Quan Huafu has obvious advantages, not only can make full use of the old lens, but also because the CCD/CMOS area of the photosensitive element is large, so the more photons captured, the better the photosensitive performance and the lower the signal-to-noise ratio. This is why Quan Huafu SLR is a major trend of digital SLR development in the future.