With your lenses you are of course very careful, but a fingerprint or greasy wipe is made. Do not brush with a handkerchief or the tip of your shirt. This can scratch the lens. Use the Lenspen Elite Original with its 2 cleaning parts. At the top is a retractable dust brush and a felt head at the bottom. Both are indispensable in the fight against dust and dirt. The Lenspen is such an accessory that should actually be in every photo bag.