Lenses come and go and as we move on we move higher up the lens latter, but according to the Canon 100-400 IS L Mk II teardown post from LensRentals, Roger Cicala is so happy with the build of this lens that it may very well earn the “Best Built Lens Ever” title.
Of course, LensRentals have to fix their own lenses after coming back and having gone through abuse, so Roger is both experienced and equipped to open a $2,200 lens, I would not try this at home.
Roger goes through taking the lens apart step by step starting with the tripod foot and ending with the optical elements. Here are some f the thoughts that will ease you into shelling out the extra $500 from the previous version:
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