This hood comes with the 100-400, so don’t buy it separately.
Pros:
- Reduces flare and ghosting when shooting in bright light.
- Helps protect your lens from dirt and scratches.
- Somewhat protects the lens in case of a fall. Better to break the hood than the front element.
- Makes you look more like you know what you are doing and helps to keep others from carelessly walking in front of you.
Cons:
- Will increase lens movement in windy situations, kind of like a sail on a boat.
- Takes up more room in your bag, even when reversed they still add to the diameter of the lens.
- People take more notice of you, will help to blow your cover if you are trying to keep a low profile.
Canon ET 83C Lens