[Brightcolours]

 This looks like a good alternative to the Sigma 18-35 F1.8 which is probably it's competitor, I think I prefer the Tamrons focal length albeit with a slightly smaller aperture, 15mm is the end that usually counts. Looks like a double sliding lenshood, but is the bulbous front element excluding filters?

  Very nice, everybody's upping the game!

 

  Announced at $1,200, so there are not going to be falling out of corn flake packets!

That Sigma is an APS-C lens design (so a fast standard zoom), this Tamron is a 135 format "full frame" design (so a fast UWA zoom on FF). This new Tamron is more a competitor to the Sony A-mount 16-35mm f2.8, Sony FE 16-35mm f4, Canon EF 16-35mm f2.8 L IS USM II, Canon EF 16-35mm f4 L IS USM, Nikkor AF-S 16-35mm f4 VR, Nikkor AF-S 14-24mm f2.8, Sigma 12-24mm, Tokina 17-35mm f4, Tokina 16-28mm f2.8 and the upcoming Canon EF 11-24mm f4 L USM. 

 

The front element is indeed excluding "normal" filters (just like with the Nikkor 14-24mm, Sigma 12-24mm, upcoming Canon 11-24mm, Tokina 16-28mm).