Usually if you look at the front of your lens it tells you what millimeter it is
Answered by Semajsalguod
Sorry, there was a problem. Please try again later.
The inside rim where the cap will grasp. (See pic)
Answered by Whatsadisplayname
Sorry, there was a problem. Please try again later.
The filter size should be on the front of the lens on the ring around the glass. Even though you have a Cannon camera, the lens could be a different brand. The value us usually next to a symbol that is a circle with a long line through it.
Answered by Arty
Sorry, there was a problem. Please try again later.