Originally posted by woodywesty Do you know if the lens coatings are a fired on ceramic or simply a tough film coating.
I don't know the specifics but the newer coatings are supposed to be very hard. I think there is as much science in the coatings as there is in the glass. And different coatings are used on different elements. I read someplace that the front element has a coating that is very hard and resistant to scratches but inner elements have coatings that are softer but have better light transmission.
I rarely clean lenses, except to blow the dust off. If I do clean I make sure all the grit is off first, with a rocket blower, then use only a micro-fiber cloth and if needed some optical glass cleaner. I think the old 'lens cleaning papers' were actually responsible for a lot of the scratches on older lenses. I often find those packs in old gear bags I buy, and I toss them as soon as I find them. Honestly you can have a lot of crud on the front element and it never be seen in an image.