In article <511oks$av5@floyd.tf.us-ny.citicorp.com>, akoticha@citicorp.com says...

>Is there a filter I can leave on my lens most of
>the time (while taking most pictures and when not
>taking any pictures)?
>The idea is to protect my lens.
>I have a UV filter, a polarizer and a ND filter. Can I just
>leave the UV on most of the time, when I'm not using the
>other filters, or is there another filter I can buy?

If the UV is a good-quality one, in good condition, there is no
harm in leaving it on for virtually all photographs (it will not
degrade image quality, except, possibly, when shooting into the
sun).
Hope This Helps