speters wrote:
I doubt that very much and it's not true!
The hardest lenses to manufacture, are the ones that contain the most Fluorite elements (it takes years to grow and requires very special treatments), also T/S lenses, especially wide ones are far more challenging to create, than a simple zoom as the 100-400! Canon's wide angle 11-24 as well, was and is far more challenging and difficult to manufacture!!
You obviously failed to read the Canon article. They contradict you even on the 11-24mm lens.
Read the articles then reply. I posted 2 of them at the beginning.