And now 82mm is the new 77mm, so I see all new filters in your future!There was a time when Canon and Nikon both made almost all their lenses the same outside diameter in order to simplify filter interchangeability. They even marketed it as a selling point. The exceptions were telephotos that could not retain the same outside diameter. If you look at Canon EF lenses, you will see that they still try to maintain some consistency with filter sizes. My 16-35 f4, 24-105, 70-200 and 100-400 all take the same filter size.