Whichever way we look at it, a 400mm f/2.8 lens for full frame cameras is going to be a large proposition. Canon has now lightened that load by producing what they claim to be currently the world’s lightest 400mm f/2.8 optic, and it is in fact only about 73% of the weight of its immediate predecessor. Does this make enough of a difference to enable hand holding for any length of time and is the new lens still the same optical quality that we have come to expect? Let’s have a close look at see if some of these questions can be answered.
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https://www.ephotozine.com/article/canon-ef-400mm-f-2-8-is-iii-lens-review–33310