A client told me my lens cleaning method was leaving micro-scratches
I've been using the same microfiber cloth and lens fluid for about five years, thinking it was fine. A regular brought in a Leica Summicron he said I'd cleaned, and under his loupe you could see very fine, straight marks. He said, 'You're wiping in one direction with too much pressure, and the cloth picks up grit.' I switched to a circular motion with almost no pressure, and I now use a fresh piece of cloth for each lens. The difference on black glass is huge. Has anyone else had to completely relearn a basic step like that?