UV filters (well actually all filters) will reduce the fstop of your lens a bit.
This is actually a benefit in digital photography. Under-exposed shots have more info than over-exposed shots. That's why professionals usually shoot 1 or 2 fstops lower when in tricky lighting or when in doubt.
There's always post-processing work to save an under-exposed shot, but nothing you can do to an over-exposed photo because there's no information in a white canvass.
Of course the primary reason of attaching a UV filter on DAY 1 is to protect the lens!
And you don't use your Tshirt or an ordinary tissue paper to clean the filter either! Get a 3M cloth at your favorite eyewear store!
To make it more confusing, you need the filter if you shooting on a harsh condition, like if it's windy, sandy or dirty. Sometimes, it's better to remove the filter (I do this when the lighting is low and I need all the clarity I can get).
So...the filter is not supposed to be on all the time. ;D
Last Edit: Jan 16, 2008 16:32:38 GMT 8 by gadgets88
It is true that one may become rich through practicing evil, but the power of Truth and Justice is that they endure... and that a man can say of them, "They are a heritage from my father." - from the book DUNE
i hate uv filters. it's just an extra piece to clean. you'd think dust won't go in the front element with the filter on but it's not the case. without a filter, i just blow (with a big giottos blower) and go. hood protects my lenses.