The filter is preferably used as a lens protector on a Nikon D90 with 18-105VR. The optical effect is assessed as neutral. It can practically remain permanently on the camera. Attaching additional filter (eg. B. Polarizer) is possible. At 18mm in APS-C no Randabdunkelung was found. Highly recommended as a lens protector - essential optical image enhancement but one should not expect (as well as can be expected, as UV filter is present in camera already). On the other hand I also not identify any adverse effects. Only in extreme backlight can u. U. without filters give slightly better results.
