AlanF said:
I have yet to put the lenshood on my 100-400mm II, and just have a Marumi filter for protection. As a matter of interest, do others us the hood - I haven't had any problems with flare yet? I always have the hood on my 300/2.8, just for lens protection.
How do you know you haven't had any problems with flare yet, have you done comparison shots?
For what its worth, and each to their own, I always use hoods and very rarely use 'protective' filters.
Here is a with and without 'protective' filter.