Scott Merryfield
Senior HTF Member
So with the 1.4 TC, that makes it around 450mm on a crop-body? Am I doing the math right?
It would be 448mm, to be exact (so yes, 450mm is darn close ).
Since you do not currently have the lens, the m2 version is definitely the way to go. The original is a darn fine lens, though, and I felt no desire to spend the money to upgrade when the new version came out -- unlike with the 100-400L, where I did upgrade.