I had to return the unfortunately already after 2 days, as a very strong vignetting showed when I came with my Tamron 18-270mm in the wide-angle range. Vignette disappeared only at about 28mm. That was unacceptable to me for landscapes and is certainly very wide version owed, because with a little narrower filters I have this problem are not.The problem is also with the polarizing filters of Hama, as we read in relevant reviews. Function of the filter, I found adequate and the darkening was clearly visible and can also be set in the viewfinder.
Note: Have no filters found the vignetting at 18mm not! The solution brought an adapter ring of 62mm to 72mm and a larger filter (72mm). However, it becomes more expensive! The optics are made of plastic, which is a careful treatment thus requires no scratches occur!
