How to protect external zoom lenses from dust ingress?
I have two tamron external zoom lenses, which for me are big investments. They are the first nice lenses I've ever had, so I don't want to be careless with them.
Is there such a thing as a lens sleeve that can stay on all the time and protects the lens from dust and moisture? Or is that overkill? Any other advice for keeping them in good shape?
Edit: They aren't weather sealed.