B-a-n-a-n-a-s.. This filter is bananas!! I was skeptical as it was relatively inexpensive but Holy sharpness batman!! I can't not express how happy I am with this fine piece of glass. In a 1:1 magnification with my photos I see no discernable loss in quality. No halos or fringing.I'm using a Sony a7 with tamrons 28-75 2.8 FYI.
09/03/2019
Beware of use with step rings. It is extremely difficult to remove if over tighten on to a step ring.
15/10/2018