Canon RF Mount: φ69.0mm x 62.8mm / φ2.7in. x 2.5in.
FUJIFILM X Mount: φ64.0mm x 65.1mm / φ2.5in. x 2.6in.
Sony E-mount: φ64.0mm x 64.8mm / φ2.5in. x 2.6in.
*The length of a lens is measured from the front of the lens to its mount
C026
The three-digit code on the surface of the lens is to indicate the year the lens was first released. (Since it is different from the year of manufacture, the release year and edition number may not match depending on the mount.)