I buy for years only Hoya or B + W filters and have hitherto been always satisfied. I own both HMC and HMC Super Filter and two I have found no effects on the image quality. Because of the price I reach lately rather only to the simple HMC filters, these fulfilled so far as we have said perfectly its purpose. Edge blurring or the like, as described by other reviewers, I have (as Pixelpeeper) not noticed.