Of course it's larger than the Sigma, because it's for full frame.
I can imagine wanting this lens in Z mount if I eventually decide to go all in and get rid of my EF gear. Which is unlikely but I can think, can't I?
It was reported sometimes as 17-40/4, which made me chuckle. I've used Canon lens with these specs a few times, even on the Z9 once, but last I remember, it wasn't a a good performer on FF as per the Photozone tests. Let's hope this new Tamron is better.
P.S. I think that as is usual with mirrorless lenses, this Tamron will have huge barrel distortion at the wide end, so using an E-mount version via adapter on Z mount will not be practical...
P.P.S. Klaus, I don't think it will kill the 20-40 any more than the 24-105/4 lenses have "killed" the 24-70 class. Some people will still want that f/2.8 aperture and the extended upper range.
P.P.P.S. Shouldn't this thread be in the Sony board?
