In article , hdh@icu.com says...

>Can a regular UV filter be kept on all times for general lens protection
>even for indoor pictures? In other words, when would I *not* want to
>use a UV filter?

Yes, a good UV filter can be left on at all times...
(Just today, I removed the bent frame of a glassless
Hoya 72mm filter from a fairly rare and excellent 28mm
f4 Nikkor PC lens. It took the brunt of a long fall to
concrete - and the owner was pleased that only minor
work was required to restore the lens to completely
normal operating condition...)
Hope this Helps
(David Ruether - http://www.fcinet.com/ruether )