If you close has eg. A bright light source of the lens (and also in the picture), it reflects the objective and there are flares! By using this UV-filter these reflections are only slightly amplified and slightly green / bluish with me. Hab for comparison still range attracted a multi-coated UV filter of Phottix and here there was exactly the same effect. Seems to be a typical UV filter problem.
PS: I use the filter only as protection!
ADDENDUM:
Have now bought a B & W filter, because to me this was recommended. Conclusion: The flares are not amplified! So it is possible! :)