Sigma apo的意思

"Sigma APO" is a designation used by Sigma Corporation, a Japanese company that produces a wide range of photographic equipment including lenses, cameras, and other accessories. The term "APO" is an acronym for "Apochromatic Optical" and is used to indicate that the lens is designed to reduce chromatic aberration, a type of optical distortion that can cause color fringing in images.

Lenses that are designated as APO are typically more expensive than standard lenses because they use special glass elements that are better at correcting chromatic aberration. This results in images that are sharper and have better color accuracy, especially when shooting at telephoto focal lengths or in situations where there is a large contrast between the subject and the background.

Sigma APO lenses are available for a variety of camera systems, including Sigma's own cameras as well as those made by other manufacturers such as Canon, Nikon, Sony, and Pentax. They are popular among amateur and professional photographers who demand high-quality optics for their photography.