[chrismiller]

The Fuji 100-400mm is longer than the Canon 100-400mm/Sony 70-400mm/Nikkor 80-400mm and just slightly less heavy.

In terms of "brickness" we really have to compare the physical focal length & speed, not the equivalent one.

The Leica 100-400mm is almost tiny in this comparison just to mention. Makes me wonder whether the Fuji is actually a full format lens ...

 

And I was talking about the size of the foot of the tripod mount, not about the ring or something.

Wouldn't the shorter flange length of the fuji body result in a longer lens (for the same optical design)?

 

It is a little disappointing they couldn't have kept the size and weight down. Pushes me towards the Leica.