In article , Arklin K.
wrote:

don't get cheap filters. get a multi-coated one, at a minimum.

Where would you get a multi-coated filter and ... what would it do for me
when all I want to do is protect the lens?

if you want to protect the lens, get a lens cap.

if you want a filter on the front all the time, get a good filter
because a cheap filter will lower the quality of your photos.

multicoated filters are important because it reduces flare and other
problems compared to an uncoated filter. that's why your lens has
multicoating. super-multicoating is even better, but the lens in
question isn't that great to begin with and not worth spending a lot of
money on a filter.