The latest accessories to be introduced in the Canon IS super-telephoto
L lens range are the EF1.4x Mk II and EF2x Mk II extenders, successors to the
current EF1.4x and EF2x.
Dust and moisture resistant, these extenders combine practicality and functionality with a new optical system that allows the user to extend the master lens focal length by 1.4x or 2x with no loss of lens performance or image quality. A new optical system offers improved compatibility with the Canon EF lens range, and there's enhanced anti-reflection processing inside the lens barrel, as well as a superior coating around the outer edges of the lens to reduce flare.
extenders are priced at 370.