If Tamron know how to make a very good 15-30mm f2.8 FX why don't they make a 15-50f2.8 DX that good ? I am sure it will be a hit lens.
Thanks for the review. Looks like an excellent lens all around, but I've seen the thing in real life, and I somehow can't get myself to like the idea of hauling that beast up mountains when the pack contains all sorts of camping stuff and food already (read: very heavy)...
I can see a 2 lens solution making sense. This excellent Tamron 15-30mm f2.8 for when you need ultra ultra wide (or a top quality UWA zoom), and then a light lens for when the weight is a real issue. I have the Voigtlander 20mm for the weight issue thing. Oh, and the EOS M + EF-S 10-18mm IS STM.
But that is semi-distant future talk, I can't afford getting FF UWA zoom now anyway. The Tamron would be a contender, but also the Canon EF 16-35mm f2.8 L IS USM II. The Canon 11-24mm f4 is too expensive to ever consider, I think.
I have Tokina 16-28 on 5D and 10-18 on 750D and for obvious reasons the I prefer 10-18 on crop camera.
At wide angle depth of field is most welcome and you don't want to do weightlifting.
A logical approach though is a lens like Tokina 10-20 from 10 to 16mm is suffers from hefty vignetting ,it works nicely on full frame as a 16-20f2.8.
I don't think they're going to abandon one format completely, though the FF UWA segment has not been very exciting up until recently as far as the independent non-stoneage makers are concerned. Sigma and Tamron only have one contemporary offering each, and even Tokina - Tokina fergrifessake! - had more... I hope to see that changed sometime soon.