I replaced my Tiffen UV glass filter on the Canon 50/1.2 L and the Canon 16-35/2.8 L lenses with the B+W UV MRC glass filter. The quality of my photographs improved dramatically. It’s good to have a glass filter on your lens to protect your investments. And at the same time, it is good to find a QUALITY glass filter like B+W. I hate to say this, the Tiffen glass filters are EXTREMELY POOR in QUALITY.