A dedicated Tamron DA18 Lens Hood that is specifically designed for use on the AF18-250mm and 18-270mm-PZ lens. It's "petal" shape maximizes the amount of hood coverage while needing a minimum amount of weight and hood area. This lens hood is designed specifically to match the focal length of the lens it is designed and dedicated for.
I had to spend a bunch of time (~ 1/2 hour at least) with customer service to get a replacement. Tamron evidently supplied defective original equipment with the lens. Replacement came after about a week and a half.
No comment needed. Appropriate attachment for the specific lens, at reasonable cost
bought a "generic" lens hood at a local camera store but it screwed on to the filter which made it hard to put on and remove. This Tamron product "clicks" on so is easy to put on and remove
This is the same hood that comes with the lens when you buy it. It has a simple 1/4 - 1/2 turnscrew thread that screws onto the end of the lens
Very practical for avoiding light directly to your lens