The Canon FD 135mm f/2.5 S.C. is a fixed focal length medium telephoto lens designed for the Canon SLR system with an FD mount. Featuring a maximum aperture of f/2.5, this component offers superior brightness compared to standard 135mm telephoto lenses, facilitating operation in limited light conditions and allowing for selective control of depth of field. The S.C. acronym indicates the Spectra Coating treatment, an anti-reflective layer applied to the lenses to improve light transmission and reduce internal reflections and ghosting. The optical structure is designed to provide sharp resolution even at wide apertures, with natural color rendition. The lens body is made of metal, following the construction standards of the FD series, and includes a built-in retractable lens hood to protect the front element from stray light.