Mount Type: Canon EF-mount/Full-Frame Format (provides an 80mm equivalent focal length on APS-C cameras).
Aperture Range: f/1.8 to f/22, offering excellent control over depth of field and suitability for low-light conditions.
Focusing: Features an AF/MF switch on the lens barrel for quick switching between autofocus and manual focus modes.
Optics: Multi-coated glass elements help to increase contrast and maintain color accuracy by reducing lens flare and ghosting.
Diaphragm: A seven-blade diaphragm contributes to a smooth out-of-focus quality (bokeh).
Minimum Focusing Distance: Can focus as closely as 1.5' (0.45m).
Contacts: Gold-plated electronic contacts convey EXIF data between the camera and lens and permit working in M, Av, Tv, and P shooting modes.
Build: The Mark I version is made entirely of plastic and weighs about 4.1 oz without caps. The Mark II version features a more durable chrome-plated metal mount and a 58mm filter thread.