What is the best aperture value?

Lead: With the development of digital technology, numbers have been integrated into us. Refers to the aperture value of the lens that can produce the clearest image on the CCD (or film) plane under the condition of correct focusing. For most high-quality lenses, the best aperture value is to reduce its maximum aperture value by one or two levels. For example, when shooting with a lens with a maximum aperture of f/2.8, the image quality with an aperture of f/4.0 or f/5.6 should be the best.

What is the best aperture value? Theoretically, the larger the aperture, the better the imaging quality, but with the increase of aperture, the aberration will increase sharply, making the imaging quality worse. In addition, a small aperture will produce diffraction (in digital photography, a small aperture will increase the exposure time and make the image appear noise), which will reduce the image quality. Therefore, the best aperture value is the balance point to avoid the above two phenomena, that is, the maximum aperture value is one or two levels lower.

Brief introduction of lens

The lens has two fingers in film and television. One is the optical element used by film cameras and projectors to produce images, which consists of multiple lenses. Different lenses have different modeling characteristics, and their application in photographic modeling constitutes an optical expression means; Two refers to a continuous picture taken from power on to power off, or a fragment between two editing points, also called a shot. One finger and two fingers are two completely different concepts. In order to distinguish, one refers to the optical lens and the other refers to the lens picture.

According to the origin of lenses, mainly Japanese lenses and German lenses. Japanese lenses mainly have good color reproduction, while German lenses have a strong sense of layering. China's lens has gradually occupied a certain market in the market, mainly because the price is relatively low.