POWER DIAPHRAGM UNIT FOR 
CANON EF 24-70MM F2.8 L II USM LENS 
 
If your getting Error 01 on the LCD, a communication error between lens and body, then this should fix the problem.
 
BRAND NEW 
 
QUALITY ITEM
 
100% MADE BY CANON INC
 
GENUINE QUALITY PARTS
 
THIS WILL ONLY FIT CANON EF 24-70MM F2.8 L II USM LENS (MARK 2) 
 
A7