According to How2fly, Tamron will announce a new 17-50mm F4 Lens for Full-Frame tomorrow?
This new Tamron lens is like a wide -angle zoom with a telephoto end up to 50mm, so it can cover the area of the standard zoom considerably , which seems to be very convenient.
It is a place where you are worried about the presence or absence of VC and the size and weight and the price.
It is rumored to be 100g lighter than Tamron 28-75mm F2.8.