Weight too. I imagine trail running with the big whites was never an option, whereas these seem quite a bit more doable. I think as photographers, we’re a little nuts and feel fine lugging heavy equipment, but sometimes when friends and family want to not be photographers and enjoy hikes and runs on a brisk pace I think these f/11 lenses would do nicely as a compromise to getting new friends (and family at the extreme)
.There's also the incognito factor; a narrow, black lens is less likely to draw unwanted attention, including that of security guards who have never seen big whites before, or robbers, or just plain old buffoons who have to drop their jaw and demand your attention to say something inane while you're busy shooting. I've stopped using the lens hood on my 400/4DO II because the flare rejection is so good (and I avoid shooting towards the light, anyway), and the hood makes the lens draw more attention.



