Only clean optics deliver good pictures. Dust and fingerprints are the biggest enemies of extremely high image quality and they also impair the optical performance of high-quality lenses or optical filters.
Heavy residue on the filter, the lens front, and even on the rear of the lens can reduce the amount of light that is allowed through to the sensor so strongly that stray light, ghost images and reflections diminish contrast and weaken colour saturation. Regular and above all correct cleaning of lenses and filters is therefore paramount for serious photographers. B+W provides new professional cleaning and maintenance products for precisely these purposes.