What's inside a camera lens? Canon 100-400mm teardown!

In this video I take apart Canon 100-400mm lens. It was broken from a drop and Canon said they could not fix it, so I decided I would do a teardown video to see just what is inside a Canon EF 100-400 mm L Series lens. I am amazed at the engineering of these lenses and marvel at whoever puts these things together! Simply awesome!
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[@ericy4522]

Well done on taking it apart! Keeping track of the parts (if you're not a Canon lens tech with the service manual) involves taking lots of photos &/or video at every step, laying out each disassembled part in order in a known orientation (face up/down, and how rotated), so you can reassemble in reverse order, and using different coloured sharpie pen &/or tape to mark where each screw/component goes where, wherever possible. Also, use Japanese Industrial Standards (JIS) screwdrivers, NOT Philips head, and avoid power tools as they can strip screw heads or threads respectively.

[@geoffheith]

Very helpful to know! Thanks so much for the info and I had no idea about the JIS screwdriver!

[@joseferson]

Excelent.

[@geoffheith]

Righteous