Originally posted by Kombivan I did pick up some under $5.00 uv filters that are suppose to correct the old lenses lack of new coating.
Mate, who told you that? They just present another surface for glare to do exactly that ... reduce contrast. Filters that are coated cost way more than $5 (to manufacture, you have to deposit the coating on them in vapour form), and even then, they can't somehow coat all the elements inside an old lens behind them.
Or even worse, these things put artifacts across your image when there's direct sunlight on the front element. UV is not the problem for digital as it might have been in the film age.
I've heard some people say they use one as some sort of substitute for a lens cap ... a layer of physical protection. Ok, if so, take it off while actually shooting. I still think a lens cap does this more robustly and is easier to remove, too.