On Aug 8, 8:32 pm, Dave wrote:
i did a ton of travelling earlier this year and got my camera lenses
quite dirty at times. (did my best to keep them clean but i was in
crazy places...)

i wiped them gently with anti-static cloths but i didn't feel good
about it.

should i buy "Multicoated" lens covers (i believe a.k.a. Neutral
Density Glass Filters)? has anyone used them?

i own the Canon 30D, and so far all Canon lenses.

thanks, dave

Gee, I didn't think they make a truly uncoated filter anymore. But
anyway, if they do, don't buy it. When light crosses an angle, it
splits like a prism. So as the ligh passes through the lens elements,
it creates little prisms as it goes. That's why the image quality is
bad.

The purpose of the coatings are to keep all of the separate colors of
light reflecting evenly and thus enhancing the image quality.

Back in the day, Isaac Newton realized the problem but didn't discover
coatings, so instead he solved the problem by inventing the mirror
lens. The reflections didn't degrade.