I had bought the UV filter, especially as dust and dirt protection. As I read here often enough that the optical quality is not affected, I thought to myself that I can not go far wrong with it. Think again. It turned out that vast amounts produced in all difficult lighting situations, eg in backlit conditions or when Nachtaufnamen with light sources in the picture, the filter of flares. Of course, I made comparison shots without the filter. I'm talking here not of small, rarely striking reflections, but of extremely disturbing flares. Some can be removed in Photoshop, some are too large or inappropriate sites. I put some pictures purely to show the effect of the most I've deleted, but a few I find certainly.
Anyway, a UV filter should not degrade the optical quality of a DSLR lens. This of Hama but does so very successfully, so that nothing remains for me but to forgive than just a star.
